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Mean Arms' Bearing Delay System (Ad-free)
🕑 Added 2025-01-27 12:00:05 +0000 UTCMean Arms has developed probably the most refined and sophisticated 9mm AR delaying system on the market, what they call Bearing Delay. This began as an exploration into fitting HK-style roller delay into and AR, and ended up with a system using three spherical bearings to redirect chamber pressure to delay opening. The system is particularly well suited to high end competition use, where the development data form Mean Arms can be use din conjunction with different "lifters" (the equivalent of the locking wedge in a roller delay system), buffers, and ammunition types to tune the system for minimal muzzle climb and felt recoil.
Disclaimer: Mean Arms sent me this upper for filming. The lower assembly I provided myself.
Comments
Stuart Morrow
But WHY is ejecting 9mm from an AR carbine a tricky proposition? Is it just me or do these look metal-3D-printed? I wish they'd just called it the steuerstueck. Lifter? That term is taken (by shotguns).
Stuart Morrow
When you want last-round holdopen
Bruce Brodnax
Very good question! I suspect that due to the lower operating pressure vs. true rifle ammo that fluting is unnecessary. I'm also pretty certain Ian would have noticed any chamber fluting and mentioned it had any been present...
David T Klein
You want an MP5, but don't want to look like a 1980s action-star slapping the charging-handle. So we've made you an MP5, but hidden it inside a CAR15, and then taken off the carry-handle/sight.
Guido Schriewer
"9" is supercheap ammunition. well IT USE TO BE put it this way. there are ar's in 9 here but I'd wish for something more... iconic. kp9 I find nice but way overpriced here. actually not many options for a semi 9mm.
Larry Schwartz
@Ian: it would be interesting to hear your thoughts on how this system compares with some of the other 9mm AR systems out there. Specifically, the CMMG radial delayed blowback...
Wayne S.
I am tempted by this upper, but there are enough 9mm guns in the safe as is.
Steve Koerner
I saw this upper on MEAN arms site and have been waiting to get one! Now I feel pretty confident that it works as advertised. Thanks Ian!
Beverly Chmelik
Now for a 10MM version?
Kerwin Kerr
Does the Mean Arms gun have a fluted chamber like the HK's?
