New XCR Bolt

[Mr Wolverine]

New XCR-L bolt assembly.
Please refer to the attached image of the parts. You will notice that they are very much like the current XCR-M parts: The firing pin is held in the carrier rather than in the bolt. Also, the recoil buffer is held in the carrier and is made of a much stronger material. The bolt is shorter. These parts assemble just like the XCR-M parts.
Caliber changes are made just like the previous L models but one must also change the firing pin module. The bolts and firing pin modules are marked for caliber. The 5.56 one will work with 5.56, 6.8, and .300 BLK. The 7.62 one will work with 7.62x39mm and 5.45x39

Older barrels, extractors, oprods, ejectors, upper receivers work with these new parts. However, for lowers to work, there must be a small modification. Please refer to the other attached picture. After the lower is modified by machining a clearance at the rear for the new buffer only new style bolts must be used as the old style buffer will no long work.
Quote “Rob Arms” - We would have preferred to not make any changes to the lower receiver. However, the change was mandatory and is not hard to make. We will provide drawings and/or a template that can be used to make the modification

Caution, when selling/purchasing caliber conversion kits you must insure that the “long” bolt goes with the old style carrier and the “short” bolt with the new style carrier. The bolt carrier must match the lower.





On the left is the “old” style lower showing the old style bolt buffer in place. On the right is the modified lower for use with the “new” style bolt which has the buffer attached to the carrier.

[shatthatkilledelvis]

May I ask - how much and how soon?

[mobusten]

Well thats disappointing since I slready spent a bunch of money on a parts kit with the old stuff.

[cavegoon]

What are the benefits of this mod?

Has RobArms moved to this style of bolt / buffer on their new rifles?

[Wakeboarder]

New XCR-L bolt assembly.
Please refer to the attached image of the parts. You will notice that they are very much like the current XCR-M parts: The firing pin is held in the carrier rather than in the bolt. Also, the recoil buffer is held in the carrier and is made of a much stronger material. The bolt is shorter. These parts assemble just like the XCR-M parts.
Caliber changes are made just like the previous L models but one must also change the firing pin module. The bolts and firing pin modules are marked for caliber. The 5.56 one will work with 5.56, 6.8, and .300 BLK. The 7.62 one will work with 7.62x39mm and 5.45x39

Older barrels, extractors, oprods, ejectors, upper receivers work with these new parts. However, for lowers to work, there must be a small modification. Please refer to the other attached picture. After the lower is modified by machining a clearance at the rear for the new buffer only new style bolts must be used as the old style buffer will no long work.
Quote “Rob Arms” - We would have preferred to not make any changes to the lower receiver. However, the change was mandatory and is not hard to make. We will provide drawings and/or a template that can be used to make the modification

Caution, when selling/purchasing caliber conversion kits you must insure that the “long” bolt goes with the old style carrier and the “short” bolt with the new style carrier. The bolt carrier must match the lower.





On the left is the “old” style lower showing the old style bolt buffer in place. On the right is the modified lower for use with the “new” style bolt which has the buffer attached to the carrier.

Just purchased an xcr-l a month ago. What is the benefit of switching over to this new system if you don't mind me asking? Are you still going to carry the older parts if we choose not to make the switch?

Thanks

[LexInfidelis]

Deleted

[mobusten]

Yeah I'm not going to go messing with something that's not broken.

[andrew3081]

So the xcr m has the same type of bolt/recoil system as the new xcr L?

[Wakeboarder]

Based on what I've read and what was explained by RobArm at shotshow, the new bolt reduces recoil and trigger slap which tbh isn't a big issue to begin with. It pretty much comes down to whether or not you want the next best thing. In my opinion the new bolt doesn't offer a big enough boost in performance for me to wanna go through the headache of modifying the lower but YMMV.

Yeah, I agree. If your gas setting is correct you shouldn't be getting trigger slap anyways. Maybe something for the future.

[Grumpy Wolverine]

So the xcr m has the same type of bolt/recoil system as the new xcr L?

The would be correct, they have changed the style to be like the XCR-M