Valhalla Enhanced Nickel Boron Bolt Carrier Parts Kit 5.56 AR15 AR-15 Roller Cam - Adams Arm's Upgrade
With Adams discontinuing their Lifecoat Bolts and completion kits, we filled a need for a new completion kit but upgraded it from the original Adams Lifecoat Kit!
Whether a Piston or Direct Impingement Build, you can complete or update an existing bolt carrier with this superior Nickel Boron Finish Kit. Kits includes an Ultra Corrosion Resistant and Slick NiBX coated firing pin and 5.56 bolt, POF NP3 roller cam for smooth cycling with reduced upper wear and a milspec cotter pin. This kit allows you to finish your carrier from a piston kit, upgrade your DI BCG, or serves as an outstanding spares kit. With the installed gas rings, the bolt works in traditional direct gas impingement (Gas key upgrade needed for Direct Impingement usage ONLY), or just remove the gas rings for your piston build (i.e. Adams Arms, Superlative Arms).
This kit includes:
- NiBX 5.56 Bolt
- NiBX Firing Pin
- POF Enhanced Roller Cam
- Mil-spec Cotter Pin
OPTIONAL UPGRADE FOR DIRECT IMPINGEMENT DI SYSTEM (AKA NON-PISTON USING GAS TUBE)
- Scalloped replacement gas key to replace the key on top of your DI BCG and allow the roller cam to be inserted and removed for cleaning.
The bolt is the heart of your weapon system. The WMD NiBX Bolt is a premium bolt upgrade that offers the highest strength with an easy clean finish. Add the benefits of nickel boron and maintain your dark low profile appearance by using your own nitrided or phosphated carrier. M16/AR15 5.56x45/.223 caliber Bolt. WMD's 5.56 Bolt Assembly-Optimized for performance. The bolt was engineered for NiB-X nickel boron coating to provide long life, ease of cleaning and superior locking and unlocking action with barrel extensions. PREMIUM AR15 Bolt AT AN OUTSTANDING PRICE!
- Bolt – Carpenter 158 case hardened, shot peened and magnetic particle inspected. Manufactured to Government drawings. Mil Spec gas rings. NiB-X coated (40% more wear resistant than Chrome).
- Extractor – Manufactured, heat treated, hardened, per Government drawings. Black extractor buffer and heavy duty spring. NiB-X coated.
NiBX Firing Pin
A broken firing pin will instantly put your weapon system out of service and is essential to have replacement on hand. The WMD NiBX Firing Pin is a premium upgrade that offers the highest strength with an easy clean finish. Add the benefits of nickel boron and keep your original as a spare! M16/AR15 5.56x45/.223 caliber. PREMIUM AR Firing Pin.
POF USA Roller Cam Pin (CHOOSE KIT WITH GAS KEY IF USING ON DIRECT IMPINGEMENT)
Cam pin wear is normal for all AR's. It is worse in piston guns do to the alternate operation, and is a result of the cam pin not being fully aligned behind the gas key. In a DI gun, gases inside the bolt carrier, pushing against the ring seals, thrust the bolt forward out of the carrier. This usually assures the bolt is fully extended before the lugs unlock and the complete BCG starts its rearward travel. In a piston gun, only the Bolt Carrier is being pushed back. Once the bolt has rotated and is free of the lugs, the carrier again is free to move rearward. However, in the piston system, the cam pin may or may not have reached its full travel, perfectly aligned behind the piston "gas" key. If not 100% aligned, the hardened square cam pin gouges into the softer aluminum upper, shaving the metal off (often seen as slivers inside the upper). The good news is it will not continue to wear once it gouges out enough clearance where the cam pin sits when the bolt lugs free from the chamber lugs in normal operation.
There are two things you can add to lessen the effect: First, a POF Roller Cam Pin which is round instead of square and rolls onto the portion of the upper where it would normally take chunks out. It will still wear this area a bit, but not nearly as much! Second is the Adams Arms bolt spring if it isn't already installed. This mimics the action in a DI gun where the hot gases push the bolt forward and achieve quicker and more complete cam pin alignment prior to releasing the carrier rearward. I recommend both for all Adams uppers and keeping spare bolt springs to replace after a couple thousand rounds.
This is a MUST HAVE UPGRADE in my book for all AR15 BCG's, but particularly for all piston uppers. This greatly reduces the wear from square cam pins that will create shavings in the upper as square cams create space for themselves. Available as an upgrade kit for Direct Impingement DI with a modified Gas Key.
Reduce friction and drag from the AR platform to stop potential failures. Standard cam pins have a stiff, square, steel head that actually grinds along and wears the inside of the aluminum receiver. POF's NP3 coated roller head actually rotates along the inside wall, enhancing performance, reduces failures and prolongs the life of the receiver.
**Kit Does NOT include bolt carrier itself. If upgrading a traditional gas AR BCG, the POF roller is larger than a standard CAM pin and needs the scalloped gas key add-on to replace the gas key on your non piston bolt carrier.