11-07-2014, 02:45 AM
Just use your JP SCS you have and see how it goes in your new build. I use them with all of my lowers and one of my lowers has multiple uppers I swap around during a day of shooting. I run a 24" Grendel, 18" Grendel, 20" 223 Wylde and a 16" Beowulf all on my Loki Lower with a JP SCS. They all cycle great and all use the same factory JP spring, I've never changed the spring but have the 3 spring pack still unopened.. Due to the extra weight of the SCS it works flawlessly wether its a rifle buffer tube or a carbine buffer tube, just use the spacer in the rifle and the cycle rate is the exact same. My other lowers are carbine buffer tubes and they have the JP's too. It is worth the weight in gold for reliablity.
Take yours out of the one rifle and give it a shot then order a second one for your other rifle. Once a JP SCS user, you never go back or you'll be disapointed when you do.
Take yours out of the one rifle and give it a shot then order a second one for your other rifle. Once a JP SCS user, you never go back or you'll be disapointed when you do.