Discussion Starter · #1 ·
when i bought my upper i just knew i wanted a heavy under the handguards barrel. well i got it and liked it just fine but i have another 20" build under way so i would like it to be lighter. i want to turn the heavy down to a reasonable dimension under the rail. what do you guys have/recommend? what is a recon under the rail? what about an SPR? how far in front of the chamber should i start to turn? i have a couple of 5.56 barrels to judge from but i thought some of you guys with the lighter 6.8 barrels could chime in or point me to a chart somewhere.