PS90 Short Barrel Rifle Conversions

Many self proclaimed “experts”, on various PS90 forums, will tell you that the factory PS90 barrel can’t be cut down and threaded as they have chrome bores and the chrome will flake and the accuracy will be poor.  That statement is only partially right.  They do have chrome bores but we have threaded well over 200 PS90 SBR barrels and none of them exhibit flaking chrome or poor accuracy.  Many of these guns have upwards of 5000 rounds thru them with no accuracy degradation.  If proper procedures are followed neither accuracy nor reliability are negatively effected when the barrel is shortened and re-crowned.   The only issue with any of these barrels was one that had so much runout between the bore and the outside of the barrel that it could not be threaded and maintain concentricity.

On our SBR conversions we cut the shroud off of the barrel and cut it back to the correct length of 10.4”.  We then thread the barrel M12x1 LH, just like the P90 SMG and install one of our custom M12x1 LH to ½-28 thread adapters.  Unlike other ½-28 adapters ours is compatible with the factory 3 point sling and allows the use of any AR-15 sound or flash suppressor. 

There are 3 basic ordering options for the PS90 SBR’s.  First, we can sell you a gun with the conversion already done.  We normally have several in stock in various configurations.  E-mail Mark McWillis at mkmcwillis@comcast.net for current pricing and availability.

If you already have a PS90 and have an approved Form 1 send us the barrel ONLY, along with a copy of the approved Form 1, and we will cut and crown the barrel, thread it M12x1 LEFT HAND and ship it back to you with a thread adapter for you to install in your receiver.  The cost for this conversion is currently $167.00 and does NOT include engraving the receiver.  Under Current BATFE regulations if you do the Form 1 conversion your name, city and state must be engraved on the receiver in plain sight in letters at least 1/16” high and at least .003 deep.