Panzer Arms AR57 ULT AR-15 Steel 5.7x28mm Upper Receiver w/ M-LOK Handguard

Convert your Mil-Spec AR-15 into a 5.7x28mm powerhouse with the Panzer Arms AR57 ULT AR-15 Steel 5.7x28mm Upper Receiver. This complete upper receiver group comes with your choice of a 12" or 16" steel barrel featuring a 1:8.5 FN twist for superior accuracy and precision, with 1/2x28 threads perfect for your favorite muzzle devices. Plus, a perforated muzzle brake helps tame recoil for flatter shooting and quicker follow-up shots. The monobloc upper receiver features aircraft 7075-T6 aluminum construction and is rated at 83000 PSI, with a corrosion-resistant hard-coat anodized finish for superior strength and lasting durability in almost any shooting environment. A free-sliding 8620 alloy bolt is removable for easy maintenance and provides smooth, consistent cycling for superior shot-to-shot performance. If that's not enough, this upper receiver group features a unique design and is top loading with spent rounds ejecting down through your lower receiver's magazine well, like a PS90. A 13-slot Picatinny rail located over the operating handle, as well as 3-slot upper and lower forward rails, provide space for your favorite weapon-mounted accessories and optics. Even better, this unique upper receiver group also features M-LOK attachment points for even more space for weapon lights, lasers, and foregrips. Product comes assembled. Includes 50-round magazine.