
Originally Posted by
Boss Hogg
when I tried to shoot a Noveske 12.5" barrel with an M4-2000 it would not function with a standard USGI buffer spring and H buffer. The bolt cycled so fast that it frequently outran several revisions of the PMAG. It is probably for this reason that the Switchblock was created.
Sprinco can make all the claims they want, but their red spring allowed my SBR to cycle semi-automatically suppressed, without frequent bolt over base malfunctions. Of course YMMV. I hope that Vltor's new A5 system makes many suppressed SBR problems go away.
FWIW, Mike Pannone is a strong proponent of Sprinco (and Noveske, BCM, etc). If you read his real-world tests, he generally uses Sprinco springs.
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