USP40 1 Posted May 21, 2010 Report Share Posted May 21, 2010 Guys , How to do form 1 on AR15 reciever ( what caliber? can I use it with different caliber?)? Thanks Jesse Quote Link to post Share on other sites
madmax4x4 68 Posted May 21, 2010 Report Share Posted May 21, 2010 You can use it with other calibers, you should list the one that will be on it the most. Or just the caliber that it is marked. You can list more then one also. Quote Link to post Share on other sites
USP40 1 Posted May 21, 2010 Author Report Share Posted May 21, 2010 You can use it with other calibers, you should list the one that will be on it the most. Or just the caliber that it is marked. You can list more then one also. Thank you much sir. Quote Link to post Share on other sites
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