skifast 2 Posted January 29, 2010 Report Share Posted January 29, 2010 I just bought as Zig Zag brake. It is for a 5.45 AK74. What size should I open the hole up to for a 7.62. I only have SAE size bits. Quote Link to post Share on other sites
Klassy Kalashnikov 1,393 Posted January 29, 2010 Report Share Posted January 29, 2010 (edited) 3/8" should be good, it will leave a .375 opening for a .308 bullet. A 5/16 bit will leave a .3125 opening which is more precise. Just make sure it's indexed/centered properly. Edited January 29, 2010 by Klassy Kalashnikov Quote Link to post Share on other sites
saigafreake 27 Posted January 30, 2010 Report Share Posted January 30, 2010 ive always used 3\8 in the past and had good results. Quote Link to post Share on other sites
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