VTS Nitride Bolt Carrier Parts Completion Kit 5.56 AR15 AR-15 BCG

Nitride Bolt Carrier Parts BCG Kit 5.56 AR15 AR-15 Completion Kit 

Complete or upgrade your existing BCG, or simply a great spare parts set for repairs. This kit allows you to finish any carrier to have a complete BCG. Just remove the gas rings for a piston system or use as is for direct impingement gas systems. 

Premium AR Bolt is machined from solid bar stock 9310 and MPI quality checked, precision machined to Mil-Spec dimensions. This AR bolt is perfect for your ground up build, or to keep on hand as spares. Precision machined Firing Pin from 8640 Steel to fit with all standard AR15 size bolts. A mandatory addition to keep in your kit as a spare. Hard chrome plated for additional durability and per Mil-Spec dimensions. 

This completion kit includes 4 parts:

1. Precision 5.56/223/300 MPI Tested 9310 Steel Nitrided Bolt with Superior Extraction via Enhanced O-ring
2. Nitrided Cam Pin
3. Chrome Plated, Heat Treated 8640 Steel Firing Pin
4. Cotter Pin
5. *Option to Add  SPRING for Piston Bolt 

Bolt Specifications:

• 9310 Solid Bar Stock
• Blacknitride
• Heat Treated
• Shot Peened
• Precision Ground
• Billet Extractor
• MPI Tested
• Extractor Insert and O-Ring Included
• Designed to be used with these Calibers: 5.56/.223/.300BLK
• 100% American Made

FAQ: Why use 9310 steel for bolt over "Milspec" Carpenter C158?

9310 steel is newer and common in Aerospace industry where intense strength is needed. It is now used by many premium firearm vendors and is approximately 7% stronger than C158 when properly heat treated. Our bolts are magnetic particle inspected to ensure consistency of  material), shot-peened to enhance surface strength, and properly heat-treated (with full certifications) for shock, abrasion, and wear. Because of this, 9310 was selected to exceed Mil-spec older Carpenter 158.