The Catch22 bolt release catch is an upgrade for the standard AR15 catch to enable manual bolt hold open and automatic bolt hold open on .22LR conversions.
It allows manual bolt hold open on all rifles and enables automatic last round bolt hold open function with:
- Smith & Wesson M&P 15-22 magazines (using an adapter for AR15 lower magwells - see below)
Also compatible with the Magpul BAD Lever
Compatible with all CMMG and Ciener format conversions including:
- CMMG
- Ciener
- Spikes Tactical
- Tactical solutions
- Chiappa / ATI dedicated uppers
- Bushmaster C22
- Nordic V3 uppers
Does not work with:
- CZ V22 uppers
- M261 conversion bolts
- Colt conversions bolts
- DPMS bolts and uppers
- Southern Gun uppers
- Nordic V1 uppers
- JP enterprise bolts and uppers
- RRA LAR-22 bolts and uppers
Lock back works with the following magazines:
- S&W M&P 15-22 (recommended - lock back fully functional)
- Kriss Defiance magazines (note pre 2024 magazines had weaker springs so benefited from a lightened pocket spring for reliable lock back - magazines post 2024 have a much stronger spring fitted so no issues)
Works but with manual lock back only:
- Black Dog Sonic X magazines
- Black Dog Gen 1 & Sig 522 magazines
- CMMG magazines
- Versacarry 28 round magazines
- Lantac & IMI magazines
How it works: the lever extends the bolt hold open latch and magazine contact points forward from the standard .223 point at the rear of the magazine. By extending the latch to the .22 feed point and bolt face it allows normal bolt hold open operation.
Fitting is a quick 5 minute parts swap, use a punch pin to partially remove the pin holding the bolt hold open catch so you can swap them over (if your AR has a roll pin fitting) minding the small spring underneath, if you have a threaded pin then it's a quick allen key job.
See our related accessories:
M&P 15-22 magazine adapter (clip on)