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The 5.45x39 Carbine Base 16" Upper comes complete and ready to go onto any mil-spec AR 15 lower. This upper is built with the Adams Arms proprietary piston system. The piston system parts and the barrel have been treated with our salt nitride Meloniting process making them harder and more corrosive resistant than hard chrome. The bolt and bolt carrier have also been protected by using an ion bond finish. Now you have the ability to shoot the inexpensive corrosive mil-surp ammo without fear of the parts being unduly worn out. Each upper also comes with a 30 round magazine and a Wolff extra power hammer spring to ignite the older hardened primers.
Upper Receiver: A4 Flat-Top, Forged
Barrel Length: 16"
Barrel Contour: Government
Barrel Material: 4150 Chrome Moly Vanadium Steel
Muzzle Thread Pattern: 1/2"-28
Chrome Lined: No
Barrel Finish: QPQ Melonite / Black Nitride
Twist Rate: 1 in 8"
M4 Feed Ramps: Yes
Bolt Carrier: 1-Piece w/Integral Piston Strike Face
Muzzle Device: Lifecoat A2 Flash Hider
Gas System Length: Carbine, Short Stroke Piston Operated
Gas Block Diameter: 0.750"
Handguard: 2-Piece Polymer, Carbine-Length
Sights: None, Single Rail Gas Block
Weight: 4.179 lbs
- Spent case sticks in chamber Review by Jay
I purchased my 5.45x39 upper from Huldra Arms. I first want to say that customer service at Huldra and Adams Arms is superb. The only issue is that if you fire the rifle in the single shot gas mode, the spent case will stick in the chamber and you will have to pry or drive it out. It will not eject when you pull the charging handle. It might work if brass cased ammo existed in the caliber. You may never want to use this function but it should be noted by Huldra and Adams so the customer is aware of this before purchase. The rifle is perfect in every other way. It has been sent to Huldra and Adams with the same result. They both gave it an excellent try but the fact is it just won't work.
(Posted on 8/16/14)