PS90 SBR Options
Looking to build or buy a short barrel PS90? FN Specialties offers both complete SBR rifles and custom conversion services. Whether you’re submitting your own Form 1 or prefer a turnkey Form 4 solution, we have the parts, services, and expertise to support your build — the right way.
Complete PS90 SBR Rifles (Transferred on Form 4)
PS90 SBR by AOK
A fully assembled PS90 short barrel rifle built on a factory FN PS90. Converted by Armory of Kings and engraved for compliance. Includes a CMMG 10.4" barrel and standard muzzle device, with optional upgrades available.
XF50 SBR Complete Build by AOK
A complete short barrel PS90 featuring the XF50 Tri-Rail upper receiver, CMMG 10.4" barrel, and muzzle device. Optional muzzle devices available at checkout. Transferred as an SBR with engraving.
Conversion & Kit Options (For Form 1 Builders)
PS90 SBR Conversion Service
Already own a PS90? Send it in and we’ll perform the full SBR conversion using a CMMG 10.4" barrel and thread adapter. Engraving is based on your Form 1 registration and must match the applicant's name and address.
XF50 Receiver Kit
Includes the XF50 upper receiver, CMMG 10.4" barrel, thread adapter, and muzzle device. Requires an approved Form 1 before installation, and must be engraved per NFA regulations prior to assembly. Designed for enthusiasts assembling their own PS90 SBR at home.
DIY
PS90 SBR Components
Factory Shroud Removal Tool
10.4" Barrel
1/2"x28 Muzzle
P90 Style Muzzle
KeyMo/KeyMicro Muzzle
Legal Notice
• All NFA rules apply.
• Form 1 builds require personal engraving that matches the name and address listed on your approved application.
• Complete SBR builds (Options 1 and 2) are engraved and transferred on a Form 4.
• Do not install SBR parts on your PS90 until you have received ATF approval.