Hi guys, So I'm broke, but dreams are free so here it goes: I'm currently reading up about various AR's (late to the game- I know) due to the local PRS league adopting gas guns into their competitions. Ideally I would LOVE a 243 on an AR10 platform, but it's just not viable at this point as I can't use it for IPSC and I would be shooting open class in PRS. So, it's a 5.56 AR15 for now that I'm looking at getting next. A lot of the guys complain about the the short OAL with AR mags, especially when looking to drive the 75 grainers. If anyone has suggestions on what mags allow for the longest cartridge, I would really appreciate suggestions as I'm hoping to push that 75gr as close to 2800ft/s as possible... Granted, when I eventually get there... which will be a while.