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Posted: 5/1/2005 12:18:00 PM EDT
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Planning on doing a pistol build shortly. Does anyone know who makes 7.5 in barrels in 1x7 twist? Or would 1x9 be better. what are the pros and cons of these two barrels? I already have other uppers and am strickly looking at 7.5 inch barrels. thanks |
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Bullet stability mostly. The 1:7 allows you to stabilize heavier bullets but will not work as well (accuracy, like that matters in a pistol AR) with bullets in the 40-55 gr. range. The 1:12 works better with bullets between 40 and 55 gr, but the 1:9 works best with bullets from 55 to 72 gr but will do a decent job with both the light weights and the heavy weights. The 1:9s I have seem to shoot most everything OK, even the 50 and 79 gr. loads. My Colt A2 1:7 loves bullets of 75 and up but absolutely detests 50 and 55 gr. bullets, with groups opening up to over twice what it shoots 75-79 gr. bullets in to. My Colt A1 1:12 eats those 50 and 55 gr. bullets like God meant it to shoot nothing else but them, cutting very nice ragged holes. My others are 1:9 and they seem to shoot everything OK, with a distinct favor for the mid weights of 65-72 gr. My Kitty Kat is 1:9 and I have only benched it a couple of times using both 55 and 63 gr. loads, and it held roughly two inch groups at 100 yards with the scope on it. Of course, after I shoot a group or two accuracy goes out the window because I cannot keep myself from going in to "bump fire" mode. A lot of fun, but not exactly what I call precision shooting. |
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