Parker Mountain Machine B.attery C.ontrol D.evice | A BAD Lever Compatible With Sig Sauer MCX’s

Published on December 30, 2024
Duration: 4:29

This guide details the installation of the Parker Mountain Machine (PMM) Battery Control Device (BCD), a BAD Lever alternative for Sig Sauer MCX Rattler LT and Spear LT platforms. The video highlights the need for specific PMM BCD variants for these models and demonstrates a method for achieving a tighter fit using tape and a zip tie to mitigate wobble, a common issue with aftermarket bolt catch levers.

Quick Summary

The PMM BCD is an aftermarket accessory designed for Sig Sauer MCX platforms, offering an enlarged bolt release. A specific 'Spear LT variant' is needed for Rattler LT and Spear LT models. Wobble can be mitigated using electrical tape and a zip tie to fill receiver gaps, ensuring a tighter fit for improved functionality.

Chapters

  1. 00:00Introduction to PMM BCD
  2. 00:16Firearm for Installation: Rattler LT
  3. 00:21Compatibility: Spear LT Variant Required
  4. 00:31Other PMM BCD Applications
  5. 00:42BAD Lever vs. PMM BCD on MCX
  6. 00:48Addressing Wobble: Tape & Zip Tie Method
  7. 01:01Benefit: Enlarged Bolt Release
  8. 01:05Cost of PMM BCD
  9. 01:09Tools and Initial Removal
  10. 01:16Included Items: Loctite & QR Code
  11. 01:25Identifying the LT Variant
  12. 01:28Removing the Old Bolt Catch
  13. 01:33Wobble Issue with Old Lever
  14. 01:37Applying Tape Shim
  15. 01:51Using Zip Tie for Tight Fit
  16. 02:00Desire for a Perfect Fit
  17. 02:13Addressing Right Side Gap
  18. 02:27Adjusting Tape and Zip Tie
  19. 02:33Applying Loctite and Reinstallation
  20. 02:50Wiping Excess Loctite
  21. 02:56Ensuring Flush Fit
  22. 03:04Screw Tightness
  23. 03:07Final Check of Fit
  24. 03:14Reduced Movement
  25. 03:17Identifying Remaining Movement
  26. 03:24No Additional Shims Used
  27. 03:30Improvement Over Previous State
  28. 03:35Reassembling Upper and Lower
  29. 03:37Pin Insertion and Alignment
  30. 03:51Post-Assembly Fit
  31. 03:57Ergonomics and Ease of Use
  32. 04:04Bolt Catch Functionality Test
  33. 04:07Locking Bolt to Rear
  34. 04:19Bolt Release Operation
  35. 04:24Call to Action: Like, Subscribe, Share

Frequently Asked Questions

What is the PMM BCD and what firearms is it compatible with?

The PMM BCD (Battery Control Device) is an aftermarket accessory similar to a BAD Lever. It's designed to enhance the bolt release function on firearms. Specifically, the 'Spear LT variant' is required for Sig Sauer MCX Rattler LT and Spear LT models, with other versions available for older MCX and standard AR-15 uppers.

Why is a specific PMM BCD variant needed for the Sig MCX Rattler LT/Spear LT?

Standard BAD Levers often do not fit correctly or can be very loose on Sig Sauer MCX Rattler LT and Spear LT platforms due to their unique receiver geometry. The PMM BCD is engineered with specific variants to address these compatibility issues and provide a more secure fit.

How can I fix wobble or looseness with an aftermarket bolt catch lever like the PMM BCD?

If your PMM BCD or similar lever exhibits wobble, you can use a combination of electrical tape and a zip tie. Tuck electrical tape into the receiver cavity and use the skinny end of a zip tie to wedge against the curved part of the receiver where it contacts the lever, filling excess space.

What is the approximate cost of the PMM BCD?

The PMM BCD is priced at around $70. This makes it a more significant investment compared to some other aftermarket bolt catch levers available on the market.

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