james peek 14 Posted June 1, 2015 Report Share Posted June 1, 2015 well sent off my gun for a pro conversion to sierra ordnance. btw he is doing a heck of a job. ran into a few snags. the last one was the brake i bought which btw is a bulgarian 74 with the zig zag cuts. it was advertized as a 762. but lee put calipers on it and discovered it is for the 545. i'm really glad he measured first and shot second. well my question is do they make a military 74 brake 24x1.5 for 762. i dont mean usa made either. i assume they only make them for the 545. i had to order an arsenal one. Quote Link to post Share on other sites
GregM1 241 Posted June 1, 2015 Report Share Posted June 1, 2015 I got mine from ak usa. One their ak 103 clones. Not sure if they are still making them. Kvar had their versions also. Its hard to find a true russian one, but they are around too. Quote Link to post Share on other sites
james peek 14 Posted June 2, 2015 Author Report Share Posted June 2, 2015 I got mine from ak usa. One their ak 103 clones. Not sure if they are still making them. Kvar had their versions also. Its hard to find a true russian one, but they are around too. so there is a russian ak 74 brake for the 762. Quote Link to post Share on other sites
GregM1 241 Posted June 2, 2015 Report Share Posted June 2, 2015 Its designed for the ak 103, but looks like the 74. Quote Link to post Share on other sites
JoeAK 337 Posted June 2, 2015 Report Share Posted June 2, 2015 You could also bore the 74 brake out a little bit to have clearance on 7.62. 1 Quote Link to post Share on other sites
GregM1 241 Posted June 2, 2015 Report Share Posted June 2, 2015 just saw this one. https://www.legionusa.com/ak74-muzzle-brake-military.html Quote Link to post Share on other sites
gunfun 3,931 Posted June 2, 2015 Report Share Posted June 2, 2015 You could also bore the 74 brake out a little bit to have clearance on 7.62. That would undo some of the perpendicular surface area which makes the thing work. I'd do it though. However, IIRC the main claim of the zigzags is that they have some chrome inside. Boring them out would undo the chrome. Quote Link to post Share on other sites
james peek 14 Posted June 2, 2015 Author Report Share Posted June 2, 2015 just saw this one. https://www.legionusa.com/ak74-muzzle-brake-military.html yeh saw that one too but its usa made. which doesn't really matter to me. then after ordering another kvar usa made one i found this https://www.k-var.com/shop/AK-140B.html Quote Link to post Share on other sites
JoeAK 337 Posted June 2, 2015 Report Share Posted June 2, 2015 You could also bore the 74 brake out a little bit to have clearance on 7.62. That would undo some of the perpendicular surface area which makes the thing work. I'd do it though. However, IIRC the main claim of the zigzags is that they have some chrome inside. Boring them out would undo the chrome. Not very much, I just measured my 74 brake (also zig-zag) and it's .345" already. Actually, all the muzzle brakes I made for my 7.62 I bored at .343 (11/32). Only a few of them had bullet strikes, but that was because the threads weren't perfectly straight. It might affect the chrome, but I never hear about issues from all the people that chop down barrels. 1 Quote Link to post Share on other sites
Mullet Man 2,114 Posted June 2, 2015 Report Share Posted June 2, 2015 Chopping the barrel cutting across the chrome isn't the same as boring into it with a drill. Quote Link to post Share on other sites
GregM1 241 Posted June 3, 2015 Report Share Posted June 3, 2015 (edited) I have two brakes. one is a E German 74 zig zag and the other is the ak 103 clone. there are very few differences. the 74 has the zig zag vents, and a bullet exit port approx 0.71cm. The ak 103 brake has a minimally larger inner chamber, barely noticeable, larger vent holes with better gas port angles, a baffle with half moon vents, and a bullet exit port of apporx 0.825cm. A modified 74 brake should work just fine. However, in terms of use of the 74 on the 223 vs the 103 on a 7.62, the 103 has a noticeably better performance. i would presume it is from the half moons vs zig zag. Edited June 3, 2015 by GregM1 Quote Link to post Share on other sites
james peek 14 Posted June 3, 2015 Author Report Share Posted June 3, 2015 I have two brakes. one is a E German 74 zig zag and the other is the ak 103 clone. there are very few differences. the 74 has the zig zag vents, and a bullet exit port approx 0.71cm. The ak 103 brake has a minimally larger inner chamber, barely noticeable, larger vent holes with better gas port angles, a baffle with half moon vents, and a bullet exit port of apporx 0.825cm. A modified 74 brake should work just fine. However, in terms of use of the 74 on the 223 vs the 103 on a 7.62, the 103 has a noticeably better performance. i would presume it is from the half moons vs zig zag. who makes your 103 clone brake? Quote Link to post Share on other sites
Mullet Man 2,114 Posted June 3, 2015 Report Share Posted June 3, 2015 (edited) Guys, the half moon vs. zig zag, is only a by product of the machining process that was used. Neither is a design function, except that they are both there to port gases. My brother whom is a machinist, explained to me how both "designs" were created, but that was like 3-4 years ago and I can't remember exactly what he said. Just sayin. Edited June 3, 2015 by Mullet Man 1 Quote Link to post Share on other sites
mancat 2,368 Posted June 5, 2015 Report Share Posted June 5, 2015 (edited) Why do you care if it's USA made or not? Have the guy bore out your existing brake, or if you must have it be correct, buy the KVar 103 brake - which is USA made. Cheapest option is the CNC Warrior brake which AFAIK is bored out for 7.62, but doesn't have the fancy zig zag or half moon cuts, just a couple drilled ports on each side. Edited June 5, 2015 by mancat 2 Quote Link to post Share on other sites
james peek 14 Posted June 6, 2015 Author Report Share Posted June 6, 2015 Why do you care if it's USA made or not? Have the guy bore out your existing brake, or if you must have it be correct, buy the KVar 103 brake - which is USA made. Cheapest option is the CNC Warrior brake which AFAIK is bored out for 7.62, but doesn't have the fancy zig zag or half moon cuts, just a couple drilled ports on each side. settled on the kvar break. 1 Quote Link to post Share on other sites
gunfun 3,931 Posted June 8, 2015 Report Share Posted June 8, 2015 It is on the statutory 922r compliance list. Quote Link to post Share on other sites
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