Rifle Build Kit - .22LR | BG Complete 16" Upper Receiver | 15" Slant Cut M-LOK HG |M4 6-Positon Stock Kit | BN LPK

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MSRP: $630.95
Sale Price: Sale Price: $379.95
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Rifle Build Kit - .22 LR | Builder's Grade Complete 16" Upper Receiver with A2 | M4 6-Position Stock and Buffer Tube Kit | Bare Necessities Lower Parts Kit

Builder's Grade Complete 16" .22LR Upper Receiver | 15" Slant Cut M-LOK | BCG & CH:

This lightweight .22 Rimfire Complete Upper Receiver comes with our precision 16 inch pencil barrel and a 15 inch Free-Float MLOK rail, with the flash hider extending past the handguard. The bolt is made of all stainless steel construction and we use an anti-jamb dedicated 22 charging handle.

Our .22 LR upper receivers are fully compatible with CMMG or similar 22 components. Our barrels and bolts are fully interchangeable and follow the same pattern as CMMG.

Compatible with RTB/CMMG .22 magazines, which you can find here

Caliber 22LR
Length 16"
Material 4150 Chrome Moly Vanadium
Profile Lightweight Pencil
Finish SBN
Dimpled? No
Twist Rate 1:16
Muzzle Thread 1/2x28 TPI
Weight 23.2oz

Bolt Carrier Group:

  • Stainless Steel Construction
  • Designed to work with all CMMG and RTB .22LR barrels
  • long lasting and reliable

Upper Receiver:

  • Machined from a Mil-Spec 7075 T6 forging Hard Coat Anodized per Mil-A-8625F, Type III
  • M4 Feed ramps
  • Made in the U.S.A.


  • 15" free float handguard
  • MIL-STD 1913 Picatinny rail on top
  • 8 M-Lok slots on 3 sides
  • Precision Machined 6000 Series aluminum, for high strength and weight savings
  • Clamp on system for easy assembly
  • Steel Barrel nut to resist movement under heat
  • Made in USA

Charging Handle:

  • Durable polymer construction with a filled-in, reinforced channel
  • .22 ARC Mil-Spec style
  • Anti-Jam Charging Handle Assembly

Tactical Sport 6-Position M4 Stock Kit:

This polymer stock is made from impact-resistant, high-strength material.

  • Mil-spec Diameter Extension Tube Made from Aircraft Aluminum with Rolled Threads
  • Built for Heavy-duty Operations with Tightest Tolerance Control
  • Stock Assembly Complete with Action Spring, Buffer Assembly, Tear-drop Ring, and Castle Nut


Bare Necessities Complete AR15 LPK:

This BN Lower Parts Kit is what you need to build a custom AR15 from the ground up. Mil-spec dimensions and coating ensure the highest quality and correct component interface.

  • Safety Selector
  • Selector Spring
  • Selector Detent
  • Magazine Catch
  • Magazine Catch Spring
  • Aluminum Magazine Catch Button
  • Bolt Catch
  • Bolt Catch Detent
  • Bolt Catch Spring
  • Bolt Catch Roll Pin
  • Take Down Pin Take Down Detent
  • Take Down Detent Spring
  • Front Pivot Pin
  • Front Pivot Pin Detent
  • Front Pivot Pin Detent Spring
  • Trigger Guard
  • Trigger Guard Roll Pin
  • Buffer Retainer Detent
  • Buffer Retainer Spring
  • A2 Pistol Grip
  • Pistol Grip Screw
  • Pistol Grip Lock Washer
  • Trigger
  • Trigger Spring
  • Hammer
  • Hammer Spring
  • Disconnector
  • Disconnector Spring
  • Hammer Pin & Trigger Pin

***Disclaimer: This made-to-order product may include minor component substitutions of military-specification quality or better. These changes, potentially differing cosmetically from shown images, ensure enhanced quality and performance. This may include ambidextrous sling loop endplates or an upgraded extra power spring.
*This product is manufactured based on parts on hand. It may feature a standard or oversized trigger guard, depending on what we have available at the time. Also, it may have a standard curved trigger or a flat trigger.*

Flat or Straight Trigger


Please Note:

Uppers may present light fouling from our quality control process and/or test firing
 All semi-auto rimfire firearms operate best with quality copper plated and full powered or high velocity 22lr ammunition.

Although .22lr AR builds do not utilize the functionality of a buffer or buffer spring, we still recommend using both to provide a stopping point/wall that prevents the 22 bolt carrier from moving rearward. Using a buffer and buffer spring will prevent light primer strikes. This is true for all Ciener/Atchisson 22 pattern platforms.