Just got a Lo-Pro Classic and am wondering what are the best fitting mags for these things? I purchased a couple of Colts and they fit reallllly tight. The DPMS 10 rounders fit well and drop free with no problem. The Colt 20 rounders fit tight and are not even close to dropping free. Thanks in advance for any info....Haven't had a chance to shoot em yet though. winter will not leave up here in Montana.