Quoted:
I'm in the market to SBR my PS90 and I see 3 methods to go about it:
1-Buy a new CMMG barrel
2-Buy a surplus P90 barrel
3-Cut the factory PS90 barrel
Option 3 would seem to be the cheapest and easiest.
My question is:
Is there a particular reason to cut the factory barrel and thread it with the left handed metric threads, then use an adapter to get to 1/2 x 28?
Why not just thread it 1/2 x 28 and be able to direct mount suppressors and normal AR muzzle devices?
Am I missing something here?
Thanks
View Quote
Yes, you're missing something. What you see on your PS90 is the barrel shroud. It has to be removed to get to the actual barrel. Every SBR barrel adapter/flash hider I've seen is threaded with the OEM metric threads and you have to have that for the barrel to mount into the gun. The barrel is REALLY a true pencil barrel.
1) barrel is threaded into the barrel shroud which provided the tension to hold the barrel into the action.
2) either drill or dremel the roll pin out on the flash hider end of shroud and knock it out.
3) unscrew barrel from the chamber end from the shroud
4) remover shroud but NOT the barrel. Take a small dowel rod and push the barrel out so that you retain the barrel springs in place.
5) insert new SBR barrel pushing out the dowel rod.
6) screw barrel into your choice of flash hider/brake/threaded for 1/2x28 suppressor barrel retaining mount.
You're DONE!!