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I purchased this for a 450 bushmaster build, the hole for the gas tube is oversized and causes the tube to be loose and cause short stroking. After finding the short stroke problem, I naught an A2 magpul stock set, didn’t help. Then I reamed the gas port, still bad.. then I changed out the BCG, still bad. Then I reseated the gas block to make sure it was correctly aligned, no luck. Then I pulled the gas block and found the gas tube loose in its hole, I replaced the gas block, the 450 bushmaster now runs great.
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