Grab a 300blk upper in time for hunting season or plinking. Features:
- 8.5″ 4150 CMV 300 Blackout Ar15 Barrel
- 5/8-24 Threads (flash hider can be left off or loose if desired, if you plan on a suppressor)
- Pistol Gas length
- .750 Low Pro steel gas block, SS gas tube
- 7075-t6 Aluminum Mil Spec Upper Receiver, anodized black
- Dust cover, Forward Assist
- 7″ MLok Free Float Handguard
Variety of Bolt carrier groups and charging handles available in the options.
Assembled, Test-Fired, and QC’d In-House
Product Overview
Our AR-15 Complete Upper delivers precision, reliability, and top-tier performance in a 18″ Midlength versatile package. Built around an 18″ 416R stainless steel fluted barrel chambered in .223 Wylde, this upper is engineered for accuracy — capable of 1 MOA or better with quality match ammunition.
Assembled and test-fired by our armorers at Mid State Firearms, this upper is ready to drop onto any standard AR-15 lower receiver for immediate range use.
Key Features
Glock 26 gen3 or 4 Slide with RMR cut. Front and rear serrations. Made in USA.
Note: If you use a sight pusher tool to install sights, use one that supports the entire side of the slide. Don’t use a mgw sight pusher that only grabs a tiny sliver of rail, that could damage your slide.
A solid Bolt Carrier Group is a key component of your Ar15. Microbest produces top quality mil-spec BCGs for the military and other quality rifle manufacturers. This 5.56 / 223 BCG features a full hard chrome exterior coating and is properly made, ready to run reliably in your rifle.
Mil Spec 8620 Carrier, Full Chrome
- 8620 Quality Steel
- Full Auto M-16 cut
Mil-Spec Bolt , Full Chrome
- Carpenter 158 Steel (c158)
- Shot Peened
- High Pressure Tested (HPT)
- Magnetic Particle Inspected (MPI)
- Sprinco Extractor and ejector springs, with sprinco insert and oring
5.1 oz h2.5 weight ar 15 / ar 9 buffer (mid between 4.6oz h2 and 5.6oz h3)
Solid piece, no rattling weights, front shoulder is slightly longer than standard buffer. Fits ar15, ar9
Looking for the perfect balance between an H2 and H3 buffer? Our 5.1 oz H2.5 AR-15 / AR-9 buffer delivers smooth cycling and improved recoil control right in the sweet spot between a 4.6 oz H2 and 5.6 oz H3.
Designed as a solid one-piece buffer (no rattling weights), this unit offers consistent performance and durability for both AR-15 and AR-9 platforms.
Professionally assembled Ar15 upper with unthreaded barrel. Whether you just want a crowned barrel or need it nonthreaded for compliance purposes, we’ve got this ar upper available for your ar15 rifle build.
16″ 5.56 NATO 1:8 Nitride barrel
4150 chromoly vanadium cmv barrel
5.56 NATO chamber (shoots 223 also)
Target crown
Mid length gas
.750 gas block diameter
Steel low profile gas block
Stainless gas tube
7075-t6 mil spec aluminum receiver, anodized black
Dust cover
Forward assist