Two Sharps Rifle Company BCG Physicals

Published on March 16, 2020
Duration: 20:27

This video provides a detailed physical inspection and testing procedure for two Sharps Rifle Company Bolt Carrier Groups (BCGs). The instructor performs a series of tests including gas ring tension, ejector and cam pin fitment, firing pin movement, extractor function, magnetism, headspace, and bolt tail seal. The inspection also utilizes a borescope to examine the internal machining quality of the carriers. While both BCGs passed basic functional checks, the analysis highlights areas of concern such as rough internal machining and potential gas inefficiency in one unit.

Quick Summary

Sharps Rifle Company BCGs feature a beefed-up tail, slab-side cuts, and modified lugs to reduce debris stoppages. Key inspection steps include gas ring tension tests, ejector and cam pin fitment checks, firing pin movement verification, and headspace measurements using GO/NO-GO gauges. Borescope examination revealed rough internal machining in both tested units, with one exhibiting a less efficient bolt tail seal.

Chapters

  1. 00:00Introduction: Sharps Rifle Company BCGs
  2. 00:46BCG Finish and Coating Identification
  3. 01:03Gas Ring Test
  4. 01:15Disassembly and Initial Checks
  5. 01:40Ejector Tension and Bevel Check
  6. 02:12Cam Pin Fitment Test
  7. 02:47Firing Pin Free Movement
  8. 02:59Extractor Removal and Inspection
  9. 03:37Extractor Gauge Test
  10. 04:28Magnetism Test
  11. 06:08Bolt Inspection
  12. 07:06Carrier Inspection
  13. 07:38Cam Pin Fitment in Bolt (Second Check)
  14. 08:05Firing Pin Protrusion Measurement
  15. 08:48Headspace Check
  16. 10:00Bolt Tail Test
  17. 10:26Carrier Key Alignment Test
  18. 10:42Firing Pin Hole Inspection
  19. 11:14Measuring Carrier Length and Gas Path
  20. 12:04Carrier Length Measurement
  21. 12:43Carrier Key Reverse Torque Test
  22. 13:35Carrier Three Pours and Borescope Prep
  23. 13:52Bolt Support Ring Gauges
  24. 14:31Gas Ring Run Test
  25. 14:59Bolt Tail Seal Test (Final)
  26. 15:54Borescope Examination: DLC/Nitrited Carrier
  27. 18:15Borescope Examination: Nickel Boron Carrier
  28. 19:10Final Physical Inspection Summary
  29. 19:44Overall Design and Company Notes

Frequently Asked Questions

What are the key design features of Sharps Rifle Company Bolt Carrier Groups?

Sharps Rifle Company BCGs are noted for a beefed-up tail, a slab-side cut on the carrier, and modified lugs with reduced material at the front. These modifications aim to decrease debris-related stoppages within the barrel extension.

How is the gas ring tension tested on a bolt carrier group?

The gas ring tension is tested by standing the bolt carrier group upright on a flat surface. If it stands on its own without falling over, the gas rings are considered to have adequate tension and seal.

What are the critical checks for bolt carrier group headspace?

Headspace is checked using specific gauges. A .223/5.56 GO gauge should close, indicating the bolt is within minimum length. A NO-GO gauge should not close, ensuring the bolt is not too long and the headspace is within safe operational limits.

What issues were found during the borescope examination of the Sharps BCGs?

The borescope revealed rough internal machining in both BCGs, particularly in the gas ring run and bolt tail run areas. The nickel boron unit also showed a less efficient bolt tail seal, potentially impacting gas efficiency.

Related News

All News โ†’

More Reviews Videos You Might Like

More from School of the American Rifle

View all โ†’