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on the bolt head, so no amount of force pushing back on the bolt can cause the bolt to unlock. When chambering a fresh cartridge the bolt head is used to push out the rollers. For that the bolt head ends in an angled/oblique wedge to smoothly move the rollers outwards into their lockup position.
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As the slide moves forward, the locking piece maintains outward pressure on the rollers. When the recesses in the slide are positioned with the rollers, the locking piece will push them out into the recesses and move forward, locking the barrel to the slide again, the barrel and slide will move
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With the locking piece stopped by the tab, the rollers will continue rearward with the slide, until they reach the recessed portion of the locking piece. The rollers will then be allowed to move inward and release from their indentations in the slide, releasing the slide from the barrel.
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The origin of the roller-locking is debated: even though the general principle of utilizing "ball bearing parts" under radial pressure "for preventing uncoupling of the coupling members" was known no later than 1910s, it was apparently not used in firearms until 1930s.
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When the gun is fired, the barrel, slide, and locking piece (right side of picture) will move backward a short distance, while the locking piece will be stopped by a tab on the frame, shown on the left with a stick pointing out the mating surface.
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At about the same time, the barrel will be stopped by the locking piece. Momentum will carry the slide back against the pressure of the recoil spring where extraction and feeding of a fresh cartridge happen similarly to other designs.
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Normally the recoil spring pushes the locking piece rearward, which in turn pushes the barrel back and holds the locking rollers. (In some of these pictures the spring is removed.)
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forward a small amount and stop. Unlike a standard
Browning short-recoil action, there is no tipping of the barrel during operation.
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In roller-locked arms in the locked position during firing, the rollers rest on parallel surfaces relative to the
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The ball-bearing roller locking system used in straight-pull rifles like the
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pistol. The slide, barrel, locking piece, and rollers are shown here.
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188:. It also spawned the Yugoslav unlicensed nearly identical
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57:. Unsourced material may be challenged and removed.
362:method and roller locking are similar in concept.
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151:. It was also applied in the experimental
117:Learn how and when to remove this message
279:Barrel, slide and locking piece, locked.
129:In firearms operating systems, the term
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343:Other locking systems with similarities
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384:The collet locking system used in the
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55:adding citations to reliable sources
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184:, Italian MG 42/59, and Austrian
480:How Does It Work: Roller Locking
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248:roller locked action diagram
440:"CZ Vzor 52: Edward Stecke"
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398:Thompson .30-06 prototype
400:which uses an expanding
349:Roller-delayed blowback
458:US patent 1088847A
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404:in a similar fashion.
367:Anschütz 1827 Fortner
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149:semi-automatic pistol
303:Beginning of unlock.
158:semi-automatic rifle
51:improve this article
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215:. You can help by
482:Forgotten Weapons
420:Interrupted screw
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190:Zastava M53
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375:Heym SR 30
351:as in the
224:April 2022
178:Bundeswehr
107:April 2022
77:newspapers
386:Blaser R8
254:bore axis
240:Mechanism
490:Category
409:See also
162:Gerät 06
154:Gerät 03
144:and the
196:History
135:rollers
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402:collet
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139:MG 42
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