157:
320:
248:
99:
748:
290:
407:
604:
595:
474:
620:
25:
736:
396:
421:, and thus manufacturers must acquire a license from Magpul before making products using the M-LOK standard. Magpul claims this gives them more control in assuring that all M-LOK products are made to specifications ensuring compatibility. Program participation is open to any interested manufacturer.
559:
The tool required for mounting, in addition to the thread size, also depends the screw head type. Hex keys are used extensively in the firearms industry, but metric and imperial hex keys as a general rule are not compatible. It is possible to damage the tool and screw by selecting a tool that is too
219:
The M-LOK system can be seen as an evolution of the Magpul
Original Equipment (MOE) system, but the two are not fully compatible. Though newer M-LOK accessories can be used on older MOE slot handguards if an adaptor plate is used, there is no adaptor available for using older MOE accessories on the
378:
Block II by introducing additional component improvements. First fielded in the same year, the main improvements are the lighter
Geissele Mark 16 free-float rail that incorporates M-LOK as the mounting method and a Daniel Defense cold hammer-forged barrel that returns to the lighter "government"
459:
20 mm (0.79 in) length intervals, and accessories can be mounted either within a slot or bridging between slots, making it possible to adjust the position of accessories in smaller intervals than the length of the slot. The slots on an M-Lok handguard are approximately 32 mm
615:
552:, which respectively have major thread diameters of 0.1640 inches and 0.1900 inches (4.166-0.794 mm and 4.826-1.058 mm expressed in metric designation). Many M-LOK screws on the international market instead use either M4 or M5
232:). Magpul released the MOE slot system in 2008 as a feature on their MOE handguards, and at the same time compatible accessories such as Picatinny rail sections, direct MOE mounted light mounts, grips, bipod studs, etc. were released.
211:
with accessories & gadgets mounted only where needed, Whereas a
Picatinny handguard typically will have whole length rail slots, resulting in heavier weight, bulkier handguard with sharp edges not user friendly, and poorer
235:
The MOE slot standard was never officially released, and a drawback to the system was that the rear side of the panel had to be accessed in order to mount accessories, limiting its application. The MOE slot system uses a
950:"This essential meaning matches that of “open” with respect to software as in the Open Source Definition and is synonymous with “free” or “libre” as in the Free Software Definition and Definition of Free Cultural Works."
258:
Acknowledging shortcomings of the MOE systems, Magpul drafted M-LOK as a new and improved mounting standard which was released in 2014 replacing the existing MOE slot. The M-LOK rail specification included
560:
small for the fastener, which can be done by using an imperial tool on a metric fastener, or the converse. An exception to this is 4 mm hex keys, which are almost the exact same size as
460:(1.260 in) long and 7 mm (0.276 in) wide and space 8 mm (0.315 in) from each other. The radius of the corners is approximately 2.38 mm (0.094 in).
1121:
244:
handguards. Also, depending on the accessory item, the spacing increments between the MOE slots were not small or uniform enough to adjust the desired placement of accessories.
747:
897:
363:
indicated that, while comparable in endurance and rough handling testing, M-LOK greatly outperformed Keymod in repeatability, drop testing and failure load testing.
35:
1114:
200:
in some applications. Compared to the
Picatinny rail system, both M-LOK and KeyMod enable the user to have a slimmer, lighter, smoother and more
1107:
580: in) hex keys preferred for consumer products because end users can successfully use an imperial key on a metric fastener, and vice versa.
1030:
1073:
371:
189:
M-LOK allows for direct accessory attachment onto the "negative space" (hollow slot) mounting points, and is a competing standard to VLTOR's
228:
A prototype of the MOE slot was revealed by Magpul in late 2007 together with their Masada
Concept Rifle (which would later be known as the
356:
240:
which has to be placed manually on the inside of the handguard before mounting, making the slot system unsuited for applications such as
50:
428:. The computer "free license" refers to a freedom to use, while Magpul only conditionally offers the license for free (analogous to a
722:
360:
336:
340:
275:, making it suited for applications on free-floating handguards. It was designed to work with both metal and polymer parts.
886:
384:
783:, and for accessories (such as extra sling mounts, vertical grips, bipods etc.) Major popularity in the civilian market.
873:
717:
While screw and slot dimensions are available on the web, the T-slot nut dimensions are currently under review by the
718:
513:
332:
72:
726:
54:
844:
961:
495:
380:
379:
profile contour as well as a mid-length gas system. Used on the M4A1 carbines by ASOC then MK18 URG-I variant
1444:
922:
344:
156:
1449:
201:
442:
featuring M-LOK rails on the handguard to better meet civilian market preferences in the United States.
399:
735:
300:
In 2017, several companies produce M-LOK handguards as well as accessories like
Picatinny rail strips,
832:
429:
1037:
548:
Attachment screws made by many U.S. manufacturers are often either #8-32 TPI or 10-24 TPI
424:
Note that although Magpul describes the license as a "free license", the meaning does not match the
1423:
1303:
1298:
1293:
1288:
1283:
1278:
1273:
1268:
1255:
1081:
1005:
1337:
786:
553:
549:
484:
179:
1061:
983:
753:
M-LOK approximate slot dimensions. (Primary measurements in millimeters, inches in parentheses.)
438:
NATO standards conform military issued assault rifles like the CAR 816 have semi-automatic only
491:
541:
1.7 Nâ‹…m (15 lbâ‹…in) for attaching polymer or metal accessories to polymer handguards.
1418:
1152:
319:
251:
229:
1238:
1233:
455:
The slot dimensions (used on handguards, etc.) are available on the web. The slots provide
272:
247:
241:
1395:
1357:
8:
1332:
1185:
1167:
1099:
770:
779:(MIL-STD-1913)—improved and standardized version of the Weaver mount. Used for both for
283:
410:
A STNGR USA 15 in (381 mm) HWK M-LOK handguard on a civilian semi-automatic
1413:
1375:
1322:
1175:
809:—early system used for scope mounts, still has some popularity in the civilian market
806:
411:
301:
183:
161:
132:
1405:
1205:
1195:
1157:
544:
1.7 Nâ‹…m (15 lbâ‹…in) for attaching polymer accessories to metal handguards.
309:
208:
538:
4.0 Nâ‹…m (35 lbâ‹…in) for attaching metal accessories to metal handguards.
803:—an older standard used for mounting slings particularly on competition firearms
1380:
1327:
1223:
1180:
1147:
776:
313:
264:
197:
98:
46:
42:
833:
KeyMod vs. M-Lok: The Next AR Rail
Standard by Chris Baker, November, 19, 2014
289:
1438:
1251:
1190:
456:
406:
260:
117:
425:
282:
developed and released the
Modular Rail Rifle (MRR) that uses a monolithic
767:—competing standard open standard design to M-LOK for mounting accessories
439:
374:(USASOC) program to further improve the durability and reliability of the
1259:
1217:
1209:
780:
418:
279:
190:
603:
594:
1228:
1139:
945:
812:
527:
498: in this section. Unsourced material may be challenged and removed.
348:
324:
268:
213:
1385:
1313:
923:"M-LOK Licensing Contact and Licensed Product Information Sheet 2019"
852:
570: in (3.97 mm). In many industries, this makes 4.0 mm (
328:
204:
186:. The license is free-of-charge, but subject to an approval process.
619:
473:
1342:
800:
432:
237:
1130:
790:
176:
1347:
795:
764:
531:
375:
293:
193:
789:—generic term for a system for attaching accessories to small
426:
more common meaning originally established in computer circles
395:
1367:
305:
725:, and until it is clarified drawings are only available to
1129:
614:
874:
M-LOK Outselling KeyMod about 3 to 1, 28 January 2016
534:
specifications depending on the handguard material:
53:, and by adding encyclopedic content written from a
887:"KeyMod™ vs. M-LOK™ Modular Rail System Comparison"
417:While M-LOK is licensed free-of-charge, it is not
355:In 2017, a summary report of testing conducted by
271:capable of only 90-degree rotation, reinforced by
1436:
721:to determine whether it should be regulated by
296:and M-LOK handguards from various manufacturers
216:ventilation increase the speed of overheating.
160:Magpul MOE M-LOK handguard on a user-assembled
984:"Caracal CAR816 A2 – An Improved H&K 416?"
402:SDMR featuring a Geissele M-LOK rail handguard
1115:
939:
463:
962:"It is Finally Here! The Caracal CAR816 A2"
445:
1122:
1108:
773:—further development from the MIL-STD-1913
97:
514:Learn how and when to remove this message
73:Learn how and when to remove this message
405:
394:
318:
288:
246:
155:
1437:
450:
34:contains content that is written like
1103:
1025:
1023:
884:
624: • Flat head counter-
341:Marine Corps Air Ground Combat Center
741:M-LOK handguard and attachment parts
496:adding citations to reliable sources
467:
372:U.S. Army Special Operations Command
286:with the M-LOK attachment system.
196:system for replacing the ubiquitous
18:
1074:"Magpul M-LOK estimated dimensions"
815:—a ringless scope mounting standard
331:on the top rail used by one of the
13:
1248:Compact and non-magnifying sights
1020:
986:. arbuildjunkie.com. 13 March 2019
628: • Button head cap
14:
1461:
327:has M-LOK rail handguard with an
903:from the original on 18 May 2017
746:
734:
618:
613:
602:
593:
472:
23:
1066:
1055:
483:needs additional citations for
1133:accessories mounting standards
1031:"magpul.com - M-LOK 2015 FAQs"
998:
976:
954:
915:
878:
867:
837:
826:
588:Hex key spanner (wrench) size
1:
819:
368:Upper Receiver Group-Improved
16:Firearm rail interface system
1220:(1 inch, 30 mm, 34 mm, etc.)
390:
7:
885:McGee, Caleb (4 May 2017).
758:
10:
1466:
1153:Quick-change barrel system
223:
182:developed and patented by
1404:
1366:
1312:
1247:
1204:
1166:
1138:
587:
464:Attachment specifications
254:with M-LOK rail handguard
146:
138:
128:
123:
114:Place of origin
113:
105:
96:
89:
964:. smallarmssolutions.com
845:"MRR MODULAR RAIL RIFLE"
446:Technical specifications
220:newer M-LOK handguards.
1006:"Caracal CAR816 A2 SBR"
787:Rail Integration System
1224:Traditional prism rail
1008:. ontargetmagazine.com
948:on opendefinition.org
414:
403:
352:
297:
263:dimensions instead of
255:
165:
409:
398:
322:
292:
250:
230:Adaptive Combat Rifle
180:rail interface system
159:
55:neutral point of view
1445:Mechanical standards
492:improve this article
273:thread-locking fluid
164:semi-automatic rifle
946:Open Definition 2.1
771:NATO Accessory Rail
719:US State Department
451:Rail specifications
339:during training at
47:promotional content
1450:Firearm components
894:thefirearmblog.com
415:
404:
353:
323:The URG-I variant
302:vertical foregrips
298:
256:
166:
124:Production history
49:and inappropriate
1432:
1431:
807:Weaver rail mount
715:
714:
711:" (3.18 mm)
699:" (3.97 mm)
682:" (2.38 mm)
670:" (3.57 mm)
526:The quarter-turn
524:
523:
516:
412:AR-15 style rifle
267:, and utilizes a
184:Magpul Industries
154:
153:
133:Magpul Industries
109:Attachment System
83:
82:
75:
1457:
1196:Warsaw Pact rail
1158:Press fit barrel
1124:
1117:
1110:
1101:
1100:
1094:
1093:
1091:
1089:
1080:. Archived from
1070:
1064:
1062:M-Lok dimensions
1059:
1053:
1052:
1050:
1048:
1042:
1036:. Archived from
1035:
1027:
1018:
1017:
1015:
1013:
1002:
996:
995:
993:
991:
980:
974:
973:
971:
969:
958:
952:
943:
937:
936:
934:
932:
927:
919:
913:
912:
910:
908:
902:
891:
882:
876:
871:
865:
864:
862:
860:
851:. Archived from
841:
835:
830:
750:
738:
710:
709:
705:
698:
697:
693:
681:
680:
676:
669:
668:
664:
622:
617:
606:
597:
583:
582:
579:
578:
574:
569:
568:
564:
556:to reduce cost.
519:
512:
508:
505:
499:
476:
468:
430:source-available
345:Twentynine Palms
101:
92:
87:
86:
78:
71:
67:
64:
58:
36:an advertisement
27:
26:
19:
1465:
1464:
1460:
1459:
1458:
1456:
1455:
1454:
1435:
1434:
1433:
1428:
1400:
1362:
1308:
1249:
1243:
1200:
1162:
1134:
1128:
1098:
1097:
1087:
1085:
1072:
1071:
1067:
1060:
1056:
1046:
1044:
1043:on 7 April 2019
1040:
1033:
1029:
1028:
1021:
1011:
1009:
1004:
1003:
999:
989:
987:
982:
981:
977:
967:
965:
960:
959:
955:
944:
940:
930:
928:
925:
921:
920:
916:
906:
904:
900:
889:
883:
879:
872:
868:
858:
856:
855:on 5 March 2016
843:
842:
838:
831:
827:
822:
761:
754:
751:
742:
739:
707:
703:
702:
695:
691:
690:
678:
674:
673:
666:
662:
661:
629:
626:sunk cap screw
625:
623:
609:
607:
598:
576:
572:
571:
566:
562:
561:
530:have different
520:
509:
503:
500:
489:
477:
466:
453:
448:
440:export versions
393:
252:Colt Canada MRR
226:
90:
79:
68:
62:
59:
40:
28:
24:
17:
12:
11:
5:
1463:
1453:
1452:
1447:
1430:
1429:
1427:
1426:
1421:
1416:
1410:
1408:
1402:
1401:
1399:
1398:
1393:
1388:
1383:
1378:
1372:
1370:
1364:
1363:
1361:
1360:
1355:
1350:
1345:
1340:
1335:
1330:
1325:
1319:
1317:
1310:
1309:
1307:
1306:
1301:
1296:
1291:
1289:Shield/Leupold
1286:
1281:
1276:
1271:
1265:
1263:
1245:
1244:
1242:
1241:
1239:S&B Convex
1236:
1234:Swarovski rail
1231:
1226:
1221:
1214:
1212:
1202:
1201:
1199:
1198:
1193:
1188:
1183:
1178:
1172:
1170:
1164:
1163:
1161:
1160:
1155:
1150:
1148:Action threads
1144:
1142:
1136:
1135:
1127:
1126:
1119:
1112:
1104:
1096:
1095:
1084:on 6 June 2019
1065:
1054:
1019:
997:
975:
953:
938:
914:
877:
866:
849:coltcanada.com
836:
824:
823:
821:
818:
817:
816:
810:
804:
798:
793:
784:
777:Picatinny rail
774:
768:
760:
757:
756:
755:
752:
745:
743:
740:
733:
713:
712:
700:
688:
684:
683:
671:
659:
655:
654:
651:
648:
644:
643:
640:
637:
633:
632:
611:
600:
590:
589:
586:
554:metric threads
546:
545:
542:
539:
522:
521:
480:
478:
471:
465:
462:
452:
449:
447:
444:
392:
389:
312:adaptors, and
284:upper receiver
225:
222:
198:Picatinny rail
152:
151:
148:
144:
143:
140:
136:
135:
130:
126:
125:
121:
120:
115:
111:
110:
107:
103:
102:
94:
93:
81:
80:
51:external links
31:
29:
22:
15:
9:
6:
4:
3:
2:
1462:
1451:
1448:
1446:
1443:
1442:
1440:
1425:
1424:QD/ Flush cup
1422:
1420:
1417:
1415:
1412:
1411:
1409:
1407:
1403:
1397:
1394:
1392:
1389:
1387:
1384:
1382:
1379:
1377:
1374:
1373:
1371:
1369:
1365:
1359:
1356:
1354:
1351:
1349:
1346:
1344:
1341:
1339:
1336:
1334:
1331:
1329:
1326:
1324:
1321:
1320:
1318:
1315:
1311:
1305:
1302:
1300:
1297:
1295:
1292:
1290:
1287:
1285:
1282:
1280:
1277:
1275:
1272:
1270:
1267:
1266:
1264:
1261:
1257:
1253:
1246:
1240:
1237:
1235:
1232:
1230:
1227:
1225:
1222:
1219:
1216:
1215:
1213:
1211:
1207:
1203:
1197:
1194:
1192:
1191:Dovetail rail
1189:
1187:
1184:
1182:
1179:
1177:
1174:
1173:
1171:
1169:
1165:
1159:
1156:
1154:
1151:
1149:
1146:
1145:
1143:
1141:
1137:
1132:
1125:
1120:
1118:
1113:
1111:
1106:
1105:
1102:
1083:
1079:
1075:
1069:
1063:
1058:
1039:
1032:
1026:
1024:
1007:
1001:
985:
979:
963:
957:
951:
947:
942:
924:
918:
899:
895:
888:
881:
875:
870:
854:
850:
846:
840:
834:
829:
825:
814:
811:
808:
805:
802:
799:
797:
794:
792:
788:
785:
782:
778:
775:
772:
769:
766:
763:
762:
749:
744:
737:
732:
731:
730:
728:
724:
720:
701:
689:
686:
685:
672:
660:
657:
656:
652:
649:
646:
645:
641:
638:
635:
634:
631:
621:
616:
612:
605:
601:
596:
592:
591:
585:
584:
581:
557:
555:
551:
543:
540:
537:
536:
535:
533:
529:
518:
515:
507:
497:
493:
487:
486:
481:This section
479:
475:
470:
469:
461:
458:
443:
441:
436:
434:
431:
427:
422:
420:
413:
408:
401:
397:
388:
386:
382:
377:
373:
370:(URG-I) is a
369:
366:In 2018, the
364:
362:
358:
350:
346:
342:
338:
334:
330:
326:
321:
317:
315:
311:
307:
303:
295:
291:
287:
285:
281:
276:
274:
270:
266:
262:
253:
249:
245:
243:
242:free-floating
239:
233:
231:
221:
217:
215:
210:
206:
203:
199:
195:
192:
187:
185:
181:
178:
174:
170:
163:
158:
149:
145:
141:
137:
134:
131:
127:
122:
119:
118:United States
116:
112:
108:
104:
100:
95:
88:
85:
77:
74:
66:
63:November 2022
56:
52:
48:
44:
38:
37:
32:This article
30:
21:
20:
1390:
1352:
1210:scope mounts
1086:. Retrieved
1082:the original
1077:
1068:
1057:
1045:. Retrieved
1038:the original
1010:. Retrieved
1000:
990:19 September
988:. Retrieved
978:
968:19 September
966:. Retrieved
956:
949:
941:
929:. Retrieved
917:
905:. Retrieved
893:
880:
869:
857:. Retrieved
853:the original
848:
839:
828:
781:scope mounts
716:
642:2.5 mm
627:
608:Socket head
599:Thread type
558:
547:
525:
510:
501:
490:Please help
485:verification
482:
454:
437:
423:
416:
367:
365:
354:
333:Green Berets
325:M4A1 carbine
299:
277:
257:
234:
227:
218:
191:open sourced
188:
173:Modular Lock
172:
168:
167:
150:2014–present
84:
69:
60:
45:by removing
41:Please help
33:
1414:Swivel stud
1376:Swivel stud
1316:accessories
1256:holographic
1218:Ring mounts
1078:grabcad.com
727:US citizens
550:UNC threads
528:T-slot nuts
419:open source
337:3rd SFG (A)
280:Colt Canada
202:fenestrated
1439:Categories
1419:Snap hooks
1229:Zeiss rail
820:References
813:Zeiss rail
653:3 mm
650:4 mm
639:3 mm
610:cap screw
504:March 2024
357:NSWC-Crane
349:California
314:flashlight
269:T-slot nut
43:improve it
1386:Versa Pod
1381:Picatinny
1328:Picatinny
1314:Handguard
1181:Picatinny
1168:Receivers
931:8 January
391:Licensing
329:LA-5C/PEQ
278:In 2016,
205:handguard
142:2007–2014
898:Archived
801:UIT rail
791:firearms
759:See also
433:freeware
316:mounts.
265:imperial
238:weld nut
209:fore-end
175:, is a
147:Produced
139:Designed
129:Designer
1279:RMR/SRO
1140:Barrels
1131:Firearm
1047:7 April
1012:7 March
907:3 March
859:4 March
706:⁄
694:⁄
687:#10-24
677:⁄
665:⁄
575:⁄
565:⁄
361:USSOCOM
351:in 2019
224:History
177:firearm
1406:Slings
1368:Bipods
1348:KeyMod
1323:Weaver
1299:CompM4
1284:C-More
1274:Docter
1252:reflex
1206:Scopes
1176:Weaver
796:SOPMOD
765:KeyMod
658:#8-32
630:screw
532:torque
457:metric
400:M110A1
376:SOPMOD
306:bipods
294:KeyMod
261:metric
214:barrel
194:KeyMod
171:, for
91:M-LOK
1391:M-LOK
1353:M-LOK
1304:Micro
1260:prism
1088:2 May
1041:(PDF)
1034:(PDF)
926:(PDF)
901:(PDF)
890:(PDF)
385:AFSOC
381:CQBRs
335:from
310:sling
169:M-LOK
162:AR-15
1396:ARCA
1358:ARCA
1333:NATO
1269:Acro
1208:and
1186:NATO
1090:2017
1049:2019
1014:2023
992:2020
970:2020
933:2023
909:2024
861:2024
723:ITAR
359:for
106:Type
1343:UIT
1338:RIS
1294:MOS
1258:or
647:M5
636:M4
494:by
435:).
383:by
1441::
1254:,
1076:.
1022:^
896:.
892:.
847:.
729:.
696:32
679:32
667:64
577:32
567:32
387:.
347:,
343:,
308:,
304:,
1262:)
1250:(
1123:e
1116:t
1109:v
1092:.
1051:.
1016:.
994:.
972:.
935:.
911:.
863:.
708:8
704:1
692:5
675:3
663:9
573:5
563:5
517:)
511:(
506:)
502:(
488:.
207:/
76:)
70:(
65:)
61:(
57:.
39:.
Text is available under the Creative Commons Attribution-ShareAlike License. Additional terms may apply.
.svg)
