$60.99
35 in stock
Online inventory may differ from in-store availability.
Quick turnaround so you get your gear sooner.
Trusted checkout with industry-standard protection.
Keeping Traditions Alive Since 1953
Secure Transactions provided with 
The FN PS90 is a fun little bullpup, but its factory barrel wears M12x1.0 left-hand threads that don't play nice with anything on the shelf at your local shop. That's the whole reason this CMMG adapter exists. It threads onto that unusual metric left-hand muzzle and gives you a clean 1/2-28 interface on the other end, which is the same thread pitch found across the vast majority of .223 and 5.56 muzzle devices. No proprietary hunting, no odd-size flash hider that only fits one gun.
This piece is aimed squarely at PS90 SBR builds, especially when you're running CMMG's own 10.4-inch short barrel. Once it's on, you can mount a flash hider, muzzle brake, compensator, or a suppressor's thread mount without any permanent changes to the barrel. It's machined from steel and wears a matte black finish, so it disappears against the rest of the platform and holds up to real use. Made in the USA and backed by CMMG's Lifetime Quality Guarantee.
Installation is refreshingly simple. It screws right onto the M12x1.0 LH barrel threads, and most folks get it done with a thin adjustable wrench and a little patience. A tip from people who've done the swap: keep track of the small spring when you pull the factory barrel, since it lines up with the frame and keeps things from shifting once the gun goes back together. Before you thread on any muzzle device, give the adapter's threads a quick clean with solvent and a copper brush so everything seats square. It's worth noting that a bit of rotational and front-to-back barrel movement is normal on the PS90, since that's part of how its delayed-blowback action works.
Bottom line, if you've already got the SBR paperwork sorted and a CMMG barrel on the way, this is the small part that ties the whole muzzle setup together and lets you run the gear you want.
It converts the FN PS90's factory M12x1.0 left-hand barrel threads over to a standard 1/2-28 TPI interface. That 1/2-28 pitch is the common standard for .223 and 5.56 muzzle devices, so it opens up your options considerably. Instead of hunting for PS90-specific hardware, you can run mainstream flash hiders, brakes, and suppressor mounts.
Yes. Once the adapter is installed you have standard 1/2-28 threads, which lets you mount a suppressor's direct-thread or quick-detach muzzle device made for .223/5.56. Just make sure your can and mount are rated for the caliber and pressure, and confirm proper alignment before firing.
It's a straightforward job for most folks. It threads directly onto the M12x1.0 LH barrel and typically only needs a thin adjustable wrench to snug down. Keep track of the small factory spring during the barrel swap, and clean the threads before attaching any muzzle device so everything seats square.
It's designed to pair with CMMG's 10.4-inch PS90 short barrel, which carries the same M12x1.0 LH thread pattern as the factory muzzle. It's a popular combination for PS90 SBR builds. If you're using a different barrel, just verify the thread pitch and direction before ordering.
| UPC | 815835017112 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | 57DA53A |
| Model | |
| Model Fit | Black |
| Product Type | Thread Protector |
| Shipping Weight | 0.11 |
You must be logged in to post a review.
Reviews
There are no reviews yet.