Testing and Evaluation: Spring kit for CMMG .22 Bolt Carrier Group

I expressed interest in a set of springs that a local fellow posted online and he was generous enough to send me a set to test and evaluate. The springs are made for the CMMG .22 Bolt Carrier Group and will work with either conversion or dedicated versions.

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Inside the package are the following:

  • stiffer recoil spring
  • softer firing pin spring
  • stiffer extractor spring

Supposedly these springs improve performance of the CMMG .22 AR kit.

Please stay tuned for updates as I will do some testing on units that have shown the following symptoms.

Symptoms:

Lower receiver using a Timney drop-in AR trigger:

Problem: Light primer strikes

Test: softer firing pin spring

Lower receiver with factory 2 stage trigger

Problem: Hammer follows the bolt to the home position during rapid-fire. Unable to shoot further unless the user racks the charging handle. Chambered round is not fired.

Test: stiffer recoil spring, stiffer extractor spring.

 

Thank you Mr. Hernandez

Please stay tuned for an update.

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