The BCM Magazine Catch Assembly (plate and the post) is precision machined Mil-Spec AISI8620 per the USGI TDP for M16/M4 family of weapons. (not to be confused with MIM parts that are very common in the commercial market) and a hardened alloy steel shaft.

The BCM Magazine Catch is machined to the Mil-Spec , then goes through a 3 step heat treat and case hardening process for optimal grain structure and wear resistance. The shaft is hardened, centerless ground, and precision threaded. Parts are assembled and staked per the USGI TDP and given a phosphate finish for corrosion resistance.


BCM Rear Takedown Pin and Front Pivot Pin

BCM Rear Takedown Pins and Front Pivot Pins are made from AISI8620 bar stock and machined per the USGI TDP for M16/M4 family of weapons. Our takedown pins are given a 3 step heat treat processes and the diameters are ground to final size prior to a corrosion resistant phosphate finish.


BCM Detents and Springs

Takedown detents include a cadmium chromate coating to resist corrosion and prevent them seizing in the small holes of the lower receiver while the Buffer retainer and Bolt Stop Plunger are made from hardened alloy steel for wear resistance and finished with a phosphate coating to prevent corrosion. The Springs are 17-7PH Stainless Steel to prevent corrosion and retain adequate tension for a lifetime of service.


This BCM Enhanced Lower Parts Kit includes:

1. BCM PNT Hammer
2. Hammer Spring
3. BCM PNT Trigger
4. Trigger Spring
5. Hammer/Trigger Pins
6. Disconnector
7. Disconnector Spring
8. Bolt Catch
9. Bolt Catch Plunger
10. Bolt Catch Spring
11. Bolt Stop Pin
12. Rear Pivot Pin
13. Buffer Retainer
14. Buffer Retainer Spring
15. Magazine Catch Button
16. Magazine Catch Spring
17. Magazine Catch
18. Rear Take Down Pin
19. Selector (Safety)
20. Selector Detent
21. Selector Detent Spring
22. BCM Enhanced Trigger Guard
23. BCM Trigger Guard Pin
24. BCM Trigger Guard Screw
25. BCM Pistol Grip Mod 3, Grip Screw, Locking Washer
26. Take Down/ Pivot Pin Detent
27. Take Down/ Pivot Pin Detent Spring


As with all BCM Life Saving Tools , Made in the USA.