You love 5.56/.223 as much as the next red-blooded American, but you can no longer resist the siren song of the 5.7x28mm. Don’t shell out big cash for a new FN P-90 PDW. Order the Ultra Light Tactical (ULT) upper assembly by Panzer Arms and turn your AR-15 into an AR-57!

Thus upper assembly contains *everything* you need to convert an AR to 5.7: melanite-finished receiver, barrel, rail, and bolt carrier group; as well as screws, a buffer, and a generously sized 50-round magazine. The top-loading and downward ejecting (i.e. spent rounds exit the magazine well) upper is made of tough aircraft aluminum and exceedingly durable. It’s lack of a gas system and free-sliding bolt make cleaning and maintenance a breeze!

This product includes a high-capacity magazine. Do not transport said magazine to or through any jurisdiction where it is illegal.
Features and Specifications:
Manufacturer Number: ULT 0116
Caliber: 5.7x28mm
Barrel Length: 16” (18” with included muzzle brake)
Barrel Material: Steel
Rate of Twist: 1:8.5" (six groove)
Barrel Thread: 1/2x28
Receiver Material: Aircraft grade 7075 T6 (“kryptonite monobloc”)
Receiver Rating: 83,000 psi
Sight System: 13-slot Picatinny
Rails: 3-slot M-LOK upper *and* lower
Bolt Material: 8620 alloy
OAL (Receiver Back to Muzzle End): 24-9/16”
Magazine Capacity: 50 rounds