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was forced into the chamber from the rear, forcing the old round out an ejection port ahead of the magazine. Springs then raised the chamber back into position where it was locked into a fixed block. The firing pin was fixed above the chamber, entering through a small hole and striking the ring of primer to fire. The chamber was normally held in the "down" position, the trigger releasing it to allow the springs to drive it upward and fire.
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The Steyr employed a unique system to cycle through ammunition: instead of driving rounds forward into the chamber and being held in place by a locking bolt, the entire chamber traveled vertically the width of the round. After firing the gases "blew" the chamber vertically downward, where a new round
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carbon steel flechette packaged in a telescoped arrangement with propellant packed around the projectile. The case of the ammunition was a cylinder 45 mm long and 10.4 mm diameter made of a lightweight translucent plastic with a grooved aluminium ring at the rear end into which the priming mixture
313:
During testing the weapon performed well, and only two problems were identified. One was that the plastic cases had varying strengths, which has some effect on the ballistics. This was considered to be a fairly minor problem, one they expected could be solved through better materials and quality
314:
control. The other issue was somewhat more difficult to solve: when the sabots left the barrel they were still going quite fast, and presented a danger to other soldiers as well as to the shooter if they bounced off the ground when firing prone.
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design with the 24-round magazine located quite close to the buttstock of the gun. The stock was "split" from the magazine forward to a location just below the sights to open for cleaning. An optical sight was included as a standard feature.
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The flechette itself weighs 0.66 g and is approximately 1.6 mm diameter and 41.25 mm long with a roughened surface to ensure the sabot and flechette stay together during shot travel. The sabot is a four-part spindle sabot made of
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held together with a plastic boot. The sum cartridge weight comes to 5.1g making the rounds less than half the weight of traditional brass-cased 5.56Ă—45mm NATO ammunition.
267:, although it is rounder and the barrel is covered for almost its entire length, as opposed to the AUG where much of the barrel was exposed. Like the AUG, the ACR is a
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design proved effective, as did most of the weapons submitted, the entire ACR program ended with none of the entrants achieving performance 100% better than the
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National
Infantry Museum, Case 444: Advanced Combat Rifle Customer Test - 1990
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Hogg, Ian V. Jane's
Infantry Weapons 1994-1995. Jane's Information Group. 1994
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Semi automatic 3-round burst at 1200rpm cyclic rounds per minute
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Rifles tested in ACR program, Steyr ACR third counting from top
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5.56Ă—45mm annular-primed SCF (synthetic case flechette)
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The Steyr ACR has some superficial resemblance to the
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457:"Advanced Combat Rifle by Department of Defense"
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247:, the baseline for a successful ACR weapon.
606:Ares Inc. Advanced Individual Weapon System
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611:McDonnell Douglas Helicopter Systems ACR
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1707:Mexican, Colombian & Chilean M1912
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120:7.12 lb (3.2 kg) (unloaded)
16:Bullpup assault rifle/Flechette rifle
989:W+F C42 (Stgw 90 "kurz Version C 2")
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292:The Steyr ACR's rounds consist of a
13:
14:
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674:Advanced Individual Combat Weapon
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418:Special Purpose Individual Weapon
239:program of 1989/90. Although the
35:Steyr Advanced Combat Rifle entry
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552:Advanced Combat Rifle prototypes
205:24-round detachable box magazine
197:4,757 ft/s (1,450 m/s)
29:
1602:Werndl M1867, M1873 & M1877
559:Prototypes during final testing
517: (archived August 30, 2003)
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308:
288:Steyr-Mannlicher ACR Cartridge
1:
1597:Wänzl M1854/67 & M1862/67
443:
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1408:Standard Manufacturing DP-12
599:Prototypes cut after Phase I
177:, vertically sliding chamber
76:United States (experimental)
7:
1863:Trial and research firearms
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10:
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1363:Heckler & Koch HK CAWS
259:Steyr ACR layout schematic
139:21.3 in (540 mm)
128:30.7 in (780 mm)
1848:Assault rifles of Austria
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1393:Mossberg 500/590 Bullpup
1190:DSR-Precision GmbH DSR-1
438:List of bullpup firearms
433:Polymer-cased ammunition
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164:5.56mm (Sabot Diameter)
1687:Dutch Mannlicher M1895
1368:High Standard Model 10
749:Heckler & Koch G11
576:Heckler & Koch G11
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303:liquid crystal polymer
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183:Rate of fire
1612:Peabody-Martini M1879
1142:Bushmaster Arm Pistol
386:U.S. patent 4,928,597
380:U.S. patent 4,848,237
374:U.S. patent 4,846,068
362:U.S. patent 4,949,493
356:U.S. patent 4,944,109
350:U.S. patent 4,930,241
344:U.S. patent 4,817,496
338:U.S. patent 4,760,663
332:U.S. patent 4,739,570
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237:Advanced Combat Rifle
1677:Krag–Jørgensen M1894
1429:ADS amphibious rifle
1225:Anti-materiel rifles
1107:Steyr AUG A3 Para XS
689:ADS amphibious rifle
499:Article on Steyr ACR
461:The Internet Archive
193:Muzzle velocity
1293:PanzerbĂĽchse M.SS41
1137:Bond Arms BullPup 9
919:Springfield Hellion
1858:Flechette firearms
1492:Steyr-Daimler-Puch
1439:S&T Daewoo K11
899:S&T Daewoo XK8
884:Pindad SS2 Bullpup
463:. 26 February 1991
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81:Production history
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699:Bushmaster M17S
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48:assault rifle
46:
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20:
1799:Machine guns
1779:
1743:Steyr SSG 08
1738:Steyr SSG 04
1728:Steyr SSG 69
1697:Mauser M1899
1617:Steyr HS .50
1348:EAA MKA 1923
1210:VSSK Vykhlop
1152:USFA ZiP .22
1125:Boberg XR9-S
1041:Machine guns
1031:Thorneycroft
979:Vektor CR-21
923:
874:OTs-14 Groza
764:Tavor TAR-21
734:FB MSBS Grot
679:Armtech C30R
580:
477:
465:. Retrieved
460:
451:
371:
329:
312:
299:
291:
274:
262:
220:
218:
175:Gas-operated
136: length
102:Manufacturer
73:Used by
1733:Steyr Scout
1662:Gewehr 1888
1647:Kropatschek
1589:Single-shot
1527:Steyr M1912
1413:UTAS UTS-15
1378:Kel-Tec KSG
1296: [
1273:HK WSG 2000
1243:Barrett M95
1238:Barrett M90
1128: [
994:Walther G22
864:NIVA XM1970
799:Kel-Tec RFB
794:Kel-Tec RDB
774:IWI Tavor 7
309:Performance
1842:Categories
1607:Gras M1874
1343:Crye Six12
1059:SAR 21 LMG
969:Valmet M82
844:Magpul PDR
839:LAPA FA-03
444:References
368:Ammunition
280:Ammunition
23:Steyr ACR
1757:Automatic
1721:Post-1945
1632:Repeating
1449:XM29 OICW
1444:XM25 CDTE
1383:Kushnapup
949:TKB-022PM
929:Steyr AUG
924:Steyr ACR
859:Model 45A
789:KAL1 GPIR
769:Tavor X95
581:Steyr ACR
413:Scicon IW
265:Steyr AUG
225:flechette
221:Steyr ACR
150:Cartridge
1640:Pre-1945
1537:M Series
1335:Shotguns
1320:WKW Wilk
1117:Handguns
1013:Carbines
944:TKB-0146
739:FN F2000
684:ASh-12.7
571:Colt ACR
403:Colt ACR
392:See also
227:-firing
94:Designed
86:Designer
1504:Pistols
1200:OTs-48K
1092:JS 9 mm
964:Type 11
959:TKB-408
954:TKB-059
939:TKB-011
934:STG-556
819:L86 LSW
804:KH-2002
759:IFAR 22
744:Grad AR
724:EMER-K1
566:AAI ACR
513:at the
467:May 11,
398:AAI ACR
294:saboted
269:bullpup
233:US Army
213:Optical
160:Caliber
62:Austria
45:Bullpup
1770:StG 58
1765:StG 44
1580:Rifles
1565:MPi 69
1388:KS-23K
1268:Gepárd
1263:Falcon
1205:QBU-88
1097:QCW-05
1082:FN P90
1054:QBB-95
909:SAR 21
889:QBZ-95
849:Malyuk
809:L64/65
661:Rifles
408:HK ACR
251:Design
210:Sights
170:Action
134:Barrel
125:Length
1827:MG 74
1822:MG 42
1817:MG 34
1812:MG 30
1560:MP 40
1555:MP 34
1422:Other
1325:PDShP
1315:SV-18
1305:RT-20
1300:]
1283:Mambi
1233:Arash
1195:M89SR
1132:]
1021:AGM-1
879:PAPOP
729:FAMAS
326:Rifle
245:M16A2
241:Steyr
1278:KSVK
984:Vepr
914:Sieg
904:SA80
854:MR-C
834:LA-4
829:LA-1
719:EM-4
714:EM-2
709:EM-1
694:BR18
669:A-91
469:2018
219:The
117:Mass
97:1987
41:Type
1785:STM
1780:ACR
1775:AUG
1570:TMP
1185:SVU
1170:Bor
1026:L22
824:L98
814:L85
784:K-3
235:'s
1844::
1532:GB
1494:/
1298:de
1130:de
459:.
1483:e
1476:t
1469:v
895:)
891:(
645:e
638:t
631:v
544:e
537:t
530:v
471:.
425:/
50:/
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