Thread: Jg m4a1
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Old April 20th, 2009, 14:15   #8
L473ncy's Avatar
Join Date: Oct 2004
Location: 11-30-24-1W5
Most guns are shipped with hop-up totally off.

Just shoot it a bit and play with the hop-up (the knob that you see when you expose the dust cover, mine is blue). It should look like this:

You'll know when your hop-up setting is good when you get the straightest and furthest trajectory without the BB going "upwards" as it exits the barrel. Also use one weight of BB only, otherwise if you switch weights you'll have to play with the hop-up again to get it to the right setting for the weight you're using currently.
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