Thread: M4 gas block
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Old July 8th, 2011, 23:06   #12
Killbox
 
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Join Date: Jul 2011
Location: Medicine Hat AB
i know, just currently, these are a cheaper alternative.

any idea where i can get a metal upper receiver for M4 carbine, the one i got is just made out of plastic, i think its gonna break sometime soon.
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