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screw side and a clamp side. With the two-screw style, the ring usually aligns well but does not have the strength of the four screw system. Many times, when tightening the screws of the four screw type, the scope can twist in place, causing misalignment. Tightening the mounts in an “X” pattern and usually starting opposite of the outside clamp side. Holding the scope slightly to the opposite side while tightening the screws usually allows for proper alignment of the scope to barrel parallel.
127:" date from the mid-1990s and have very strict military standard dimensions and tolerances. The Picatinny rail has a similar profile to the Weaver, but the recoil groove width of the Picatinny rail is 0.206 in (5.23 mm) versus 0.180 in (4.57 mm) of the Weaver rail/mount, and by contrast with the Weaver, the spacing of the Picatinny recoil groove centers is consistent, at 0.394 in (10.01 mm).
17:
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greater distance. Lower grade materials used in manufacturing of scope bases, inconsistent design tolerances from one manufacturer to another, and other factors can cause twisting stress and cause the mount to move out of parallel with the rifle barrel. The locking bar system allows for even stress to be distributed and prevent canting of the scope mount.
107:
cross hairs indicate a point of aim (POA) exactly at a bullet's point of impact (POI) at a known distance, a small variation of even one quarter of one degree can cause massive problems at longer ranges. The locking bar holds the mount in a perfect 90 degrees to the rail system, whereas a non-locking bar system can cant to the left or right.
136:
because the
Picatinny locking slot width is 0.206 in (5.232 mm) vs the .180 width of the Weaver, and the spacing of slot centers is 0.394 in (10.008 mm). Because of this, with devices that use only one locking slot, Weaver devices will fit on Picatinny rails, but Picatinny devices
140:
Another difference is that Weaver rails are continuous with only two to four recoil grooves cut, while
Picatinny rails have recoil grooves cut across the entire length of the rail at the above noted spacing (like a dotted line). This allows for more mounting position flexibility and also helps to
110:
This canting, sometimes called jamming of surfaces, is caused by not matching the clamping surface perfectly to the rail. When tightened down, stress exerted on the base can cause the scope's POA to be off from the POI by as much as several feet at 100–200 yards, and gets progressively worse with
106:
The lack of a locking bar on many Weaver-type accessories lends to another alignment issue: side-to-side canting. Although this issue is not common, it can be very problematic especially with scopes. Because scopes need to be mounted to a rifle in perfect parallel to the barrel, and to ensure the
114:
Another form of scope canting is caused by the rings themselves. Many Weaver-type mounts, including many
Picatinny-type scope rings and even the Redfield Type, have either two or four screws on top of the scope ring that hold the scope in place. Both the Weaver and Picatinny clamp systems have a
90:
The two piece type can be problematic on some rifles that do not allow for the two pieces to be mounted due to metal thickness of the receiver, or other issues of receiver length that will not allow for proper distance to hold the scope. With the later one piece approach, the rail system remains
86:
Older Weaver systems used two pieces mounted a distance apart from one another, typically on the receiver of a rifle over the bolt opening, where the cartridge would be inserted and/or ejected. However, alignment problems of the two piece system can put undue stress on a rifle scope and cause
87:
problems between the scope and rifle barrel parallels and bullet Point Of Impact (POI). The two piece system must be mounted with exacting tolerances to ensure perfect alignment, using a scope alignment device called
Alignment Sleeves.
94:
The slots on a Weaver system are primarily used as a clearance of the locking screw that tightens the clamp to the rail. Some Weaver-type accessories have a bar that fits inside the machined slots on the rails while many others do not.
59:
The Weaver mount was developed by
William Ralph Weaver (1905 – 8 November 1975) at his telescopic sight company W.R. Weaver Co., which he founded in 1930. Previous systems included the
332:
130:
Many rail-grabber-mounted accessories can be used on either type of rail, and accessories designed for a Weaver system will always (SWP) fit
Picatinny rails – although not
325:
318:
290:
224:
98:
Weaver rails have a slot width of 0.180 in (4.57 mm), but are not necessarily consistent in the spacing of slot centers.
51:, developed by the US military, is a development of the key concepts of the Weaver system, and they are partially compatible.
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180:
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mounts. Compared to the
Leupold mount, the Weaver rail is not as strong and cannot be adjusted for
548:
150:
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197:
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363:
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60:
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75:
232:
624:
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44:. It uses a pair of parallel rails and several slots perpendicular to these rails.
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W.R. Weaver Co. became Weaver Optics, and was a subsidiary of
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601:
578:
563:
260:
Gun Digest Guide to
Maintaining & Accessorizing Firearms
340:
175:. Skyhorse Publishing Company, Incorporated. p. 289.
78:'s Security and Sporting division in Onalaska, Wisconsin.
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from 2002 to 2008, when it was on-sold to become part of
291:"Picatinny Rails, Weaver Rails, What's The Difference?"
647:
225:"Weaver Optics: An American Tradition In Optics"
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141:neutralize expansion caused by barrel heating.
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326:
277:
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168:
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263:. Krause Publications. pp. 168–169.
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189:
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202:. Taylor & Francis. pp. 364–.
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195:
314:
137:will not always fit on Weaver rails.
123:The military standard, MIL-STD-1913 "
172:Shooter's Bible Guide to Bowhunting
13:
459:Compact and non-magnifying sights
14:
672:
299:
257:Muramatsu, Kevin (14 July 2014).
169:Todd A. Kuhn (13 December 2013).
199:The Theatrical Firearms Handbook
344:accessories mounting standards
216:
1:
196:Inouye, Kevin (30 May 2014).
156:
72:Meade Instruments Corporation
431:(1 inch, 30 mm, 34 mm, etc.)
119:Compatibility with Picatinny
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36:) and other accessories to
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364:Quick-change barrel system
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615:
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91:consistent in alignment.
151:Rail integration system
28:is a system to connect
435:Traditional prism rail
21:
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235:on February 28, 2007
661:Alliant Techsystems
76:Alliant Techsystems
656:Firearm components
22:
643:
642:
270:978-1-4402-3989-2
209:978-1-317-85981-9
182:978-1-62873-404-1
30:telescopic sights
26:Weaver rail mount
668:
407:Warsaw Pact rail
369:Press fit barrel
335:
328:
321:
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231:. Archived from
223:Fortier, David.
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61:Leupold/Redfield
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125:Picatinny rails
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500:Shield/Leupold
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450:S&B Convex
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445:Swarovski rail
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359:Action threads
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300:External links
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229:Shooting Times
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49:Picatinny rail
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635:QD/ Flush cup
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402:Dovetail rail
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306:Weaver Optics
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32:(often via a
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20:A Weaver rail
18:
533:
421:scope mounts
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259:
237:. Retrieved
233:the original
228:
218:
198:
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164:
139:
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40:and certain
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23:
625:Swivel stud
587:Swivel stud
527:accessories
467:holographic
429:Ring mounts
34:scope mount
650:Categories
630:Snap hooks
440:Zeiss rail
239:14 January
157:References
133:vice versa
47:The later
597:Versa Pod
592:Picatinny
539:Picatinny
525:Handguard
392:Picatinny
379:Receivers
293:Brownells
42:crossbows
145:See also
102:Failings
82:Features
38:firearms
490:RMR/SRO
351:Barrels
342:Firearm
65:windage
55:History
617:Slings
579:Bipods
559:KeyMod
534:Weaver
510:CompM4
495:C-More
485:Docter
463:reflex
417:Scopes
387:Weaver
267:
206:
179:
602:M-LOK
564:M-LOK
515:Micro
471:prism
607:ARCA
569:ARCA
544:NATO
480:Acro
419:and
397:NATO
265:ISBN
241:2015
204:ISBN
177:ISBN
554:UIT
549:RIS
505:MOS
469:or
652::
465:,
279:^
249:^
227:.
67:.
24:A
473:)
461:(
334:e
327:t
320:v
273:.
243:.
212:.
185:.
Text is available under the Creative Commons Attribution-ShareAlike License. Additional terms may apply.
