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Old August 1st, 2009, 04:57   #1
Join Date: Jul 2009
question - Top Tech M4 Carbine Blowback

i have a question about Top Tech M4 Carbine Blowback.
i wanna install in the gun a 130M Spring.
can i do that?
i need to change a few parts to change to 130M Spring?

and tell me it also about 140M Spring.

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