washguy Posted March 22, 2015 Report Share Posted March 22, 2015 My brothers...last July H over at ARP decided to start production on a new lightweight upper for DPMS style lowers that would bring the weight down to near ar15 weight. I was fortunate enough to be one of the first 10 "testers" before they are offered. The first run of billet uppers,custom bcg,and 16" helical fluted barrels are now ready...I think there are some .260 cals available too. I got mine last week and used a DPMS lower off a working rifle. H got best cycling with a Sprinco orange spring and lancer mag..so thats what I used along with a 308car buffer. the upper fits like a glove on the lower ...I built it as light as I could using a BCM KMR 13.5" ar15 rail...yes it uses ar15 hand guards. and a Rogers Super Stock,and a "shorty brake" ...weigh in with the lancer empty 10 rd mag and no optics.... 6.5 lbs yippee I changed the brake to a PRI comp..so she weighs a few more ounces now So last week it was raining and I had to go to the hell hole indoor darker than a midnight alley range to test...brought my trusty flashlight with me which promptly went out after 15 mins. she was short stroking on some ammo and working on others...played with some different buffer springs but I couldnt work in that dark hole...the lancer mag needed a lil tweak but I didnt wanna do it there...so brought it home and tweaked it...she hand cycles perfect now....I took her apart to check the adj gas block and check the diameter of the gas port H calls for a .082 for the 308 and .070 something for the .260 well I found the short stroke problemo... the gas port was smaller than .082 so I opened her up to that size...okay lets go shoot that baby....not...I had my face cut on Friday and Char refused to let me go test with fresh wounds in that stinkhole indoor place and its still raining here...so this week for sure btw she weighs 8lbs 1 oz with a nikon M-308 you can find the skinny at the 68forum under vendor partners AR15 perf. posting "12" :) Wash Quote Link to comment Share on other sites More sharing options...
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