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Old April 16, 2012, 06:38 PM   #2
James K
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Join Date: March 17, 1999
Posts: 18,637
Another AR gadget. It looks like they use a small diameter spring on a guide rod instead of the full diameter spring that gives the AR that neat "twannnnggg" when loading the first round.

Some guns of that general AR appearance, like .22's, are blowback, not gas operated, and apparently their spring won't work with those or with the 9mm carriers and bolts. The regular 5.56mm/.223 carrier is hollow, where those guns have a solid carrier to get the mass needed for blowback operation.

Jim
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