Rankin Industries Bolt Carrier Group SP4 Coating

$274.99

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Product Description

Rankin Industries SP4 Coated Bolt Carrier Group Mil Spec M-16 AR-15 5.56

“No Lubrication Needed”

“Lifetime Warranty”

Rankin Industries SP4 Coated Bolt Carrier Group Mil Spec M-16 AR-15 5.56 full auto version can be used in semi-auto rifles and pistols.  This is for full auto or semi auto AR15, M16, and M4 rifles and pistols.   machined from Mil-Spec 8620 aircraft quality steel with shrouded firing pin and Mil-Spec chrome lined interior. The SP4 coated bolt carrier includes the proper chrome lined and heat treated gas key. The gas key is secured to the carrier with Grade 8 fasteners and properly staked per Mil-Specs. This ensures a strong staking and proper gas system functioning. The bolt assembly is CNC machined from Mil-Spec Carpenter No. 158® steel and shot peened for increased strength per Mil-Spec.  The SP4 Coated bolt carrier includes tool steel extractor with spring and viton O-ring.

Rankin Industries SP4 Coated Bolt Carrier Group Mil Spec M-16 AR-15 5.56 is designed to reduce the friction coefficient.   This lowers the operating temperatures and increases the overall performance and the Bolt Carrier Group’s life.

Backed by a lifetime guarantee, you can be confident that this coated BCG will increase lubricity and wear resistance.  This bolt carrier will provide a smoother recoil, improved consistency, faster cyclic rate and reduce carbon fouling.

SP4 Coating is on the following parts: Bolt Carrier, Carrier Key, Cam Pin, Firing Pin, Bolt, Extractor, Gas Rings.

HPT (High Pressure Tested) and MPI (Magnetic Particle Inspected).

Rankin Industries Complete Mil-Spec M-16 Bolt Carrier with Bolt Assembly HPT/MPI Tested:

  • Mil-Spec BCG Machined from 8620 Aircraft Quality Steel and heat treated to 60-61 RC
  • Mil-Spec Chrome Lined Carrier Interior
  • Mil- Spec Chrome Lined Gas Key from 4130 Steel
  • Key Staked with Grade 8 Screws and torqued to 58 inch pounds per Mil Spec.
  • Mil-Spec Carpenter 158® Bolt w/ Spring and Ejector
  • Tool Steel Extractor w/ Spring and viton O-ring
  • Mil-Spec Firing Pin
  • Mil-Spec Cam Pin
  • Full Auto Carrier is Backward compatible with all semi-auto rifles
  • Full Auto M-16 5.56 BCG Weight – 11.40 oz.
  • SP4 is a Thin Film that has a thickness between 2 and 3 microns
  • Hardness is 3000 on the Vickers scale
  • Friction Coefficient is an incredible  .02
  • SP4 is also the most flexible coating on the market.
  • SP4 is #1 in Hardness; #1 in Low Coefficient of Friction; #1 in Flexibility and Elasticity
Rankin Industries bolt carrier groups are made in the U.S.A. and backed by a lifetime warranty. Should your BCG fail to function properly, Rankin Industries will get you taken care of.

Rankin Industries Complete Mil-Spec M-16 Bolt Carrier with Bolt Assembly HPT/MPI Tested:

  • Mil-Spec BCG Machined from 8620 Aircraft Quality Steel and heat treated to 60-61 RC
  • Mil-Spec Chrome Lined Carrier Interior
  • Mil- Spec Chrome Lined Gas Key from 4130 Steel
  • Key Staked with Grade 8 Screws and torqued to 58 inch pounds per Mil Spec.
  • Mil-Spec Carpenter 158® Bolt w/ Spring and Ejector
  • Tool Steel Extractor w/ Spring and viton O-ring
  • Mil-Spec Firing Pin
  • Mil-Spec Cam Pin
  • Full Auto Carrier is Backward compatible with all semi-auto rifles
  • Full Auto M-16 5.56 BCG Weight – 11.40 oz.
  • SP4 is a Thin Film that has a thickness between 2 and 3 microns
  • Hardness is 3000 on the Vickers scale
  • Friction Coefficient is an incredible  .02
  • SP4 is also the most flexible coating on the market.
  • SP4 is #1 in Hardness; #1 in Low Coefficient of Friction; #1 in Flexibility and Elasticity
Rankin Industries bolt carrier groups are made in the U.S.A. and backed by a lifetime warranty. Should your BCG fail to function properly, Rankin Industries will get you taken care of.

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