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The Range
Rifle & Shotgun Discussion
American Rifle Company 10 round AI mag
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<blockquote data-quote="rockchalk06" data-source="post: 3978917" data-attributes="member: 40794"><p>Update on this mag.</p><p></p><p>Both myself and [USER=47802]@conditionzero[/USER] had all kinds of issues with this mag yesterday at the range. Random rounds were nose diving under the feedramp and the bolt was jumping over the rounds at various times.</p><p></p><p>When I received the mag, I took the floorplate off and cleaned everything.</p><p></p><p>Decided to put it in my HMR Pro in 308 to try, same issue. Called ARC and spoke with Bella. She was pretty helpful. Gave me the measurements of the inside with of the feedlips front to back. Also the measurements from the bottom of the catch to the top of the mag. That was spot on, but the feedlips were not. Should measure .392" at the front and .379" at the rear. Mine was .381" at the front and .372 at the rear. She asked if I was willing to mess with them and ensured if I fubar'd it up, warranty would cover it.</p><p></p><p>With several years of tuning STI mags to run in a 2011 40, I felt fairly confident I could do it. After a few minutes, I had them were I wanted them. Ran a total of 40 rounds through with zero issues. That was in my HMR pro.</p><p></p><p>My HMR does not have near the clearance on the side of the feedramp to keep the rounds from catching on the bottom. The pro is machined differently and has more room. I had an issue with running long VLD's from the mag in the beginning and ended up dremmeling out a groove in the feedramp to match the Pro. Runs VLD's seated way out to 2.875", but still too much meat on the bottom corners of the feedramp.</p><p></p><p>While I'm a little miffed that I had to tune the mag, Nothing is perfect and I'm ok with delegating it to 308 HMR Pro duty. I'll run my 5 round Bergara mags in the HMR for now. I'll try some AI factory mags next.</p><p></p><p>EOR</p></blockquote><p></p>
[QUOTE="rockchalk06, post: 3978917, member: 40794"] Update on this mag. Both myself and [USER=47802]@conditionzero[/USER] had all kinds of issues with this mag yesterday at the range. Random rounds were nose diving under the feedramp and the bolt was jumping over the rounds at various times. When I received the mag, I took the floorplate off and cleaned everything. Decided to put it in my HMR Pro in 308 to try, same issue. Called ARC and spoke with Bella. She was pretty helpful. Gave me the measurements of the inside with of the feedlips front to back. Also the measurements from the bottom of the catch to the top of the mag. That was spot on, but the feedlips were not. Should measure .392" at the front and .379" at the rear. Mine was .381" at the front and .372 at the rear. She asked if I was willing to mess with them and ensured if I fubar'd it up, warranty would cover it. With several years of tuning STI mags to run in a 2011 40, I felt fairly confident I could do it. After a few minutes, I had them were I wanted them. Ran a total of 40 rounds through with zero issues. That was in my HMR pro. My HMR does not have near the clearance on the side of the feedramp to keep the rounds from catching on the bottom. The pro is machined differently and has more room. I had an issue with running long VLD's from the mag in the beginning and ended up dremmeling out a groove in the feedramp to match the Pro. Runs VLD's seated way out to 2.875", but still too much meat on the bottom corners of the feedramp. While I'm a little miffed that I had to tune the mag, Nothing is perfect and I'm ok with delegating it to 308 HMR Pro duty. I'll run my 5 round Bergara mags in the HMR for now. I'll try some AI factory mags next. EOR [/QUOTE]
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