Centerfire systems - Looking to build your own custom .223, 5.56, 7.62, or .300 Blackout Carbine? We've got all the Parts & Accessories you need!

August 3, 2016 View this email in your browser AR-15 Gas Tube Length VS. Barrel Length WHAT'S THE DIFFERENCE? HERE'S THE "SHORT" ANSWER... The AR-15 platform operates using a direct gas impingment (DGI) system Although the barrel length and rate of twist affect the accuracy of the round, the additional factor of the length of the gas tube determines how much time the round takes to travel through the barrel. As inertia peaks from the expending propellant, excess pressure behind the round travels through the gas tube, back to the upper receiver and is used to cycle the bolt carrier group. Since the volume of gas expansion created by the propellant remains a constant, it is the length of the gas tube that primarily determines cycle times, feeding & ejecting reliability, and felt recoil. AR-15 M4 .223/5.56 Carbine Length Complete Kit 16" Barrel KIT0031 $369.99 Buy Now AR-15 16" A3 .223/5.56 NATO Carbine Parts Kit ACC0011 $439.99 Buy Now DTI AR-15 M4 .223/5.56 NATO Parts Kit ACC0033 $439.99 Buy Now AR-15 Complete MIL-STD 105D Lower Parts Kit ACC0002 $49.99 Buy Now Korean AR-15 30rd .223/5.56 Blued Steel Mag MAG0301 $8.99 Buy Now AR-15 .223/5.56 Complete Pistol Kit with 7" Barrel KIT0032 $379.99 Buy Now AR-15 A3 .223/5.56 NATO 16" Mid Length Parts Kit ACC0012 $474.99 Buy Now AR-15 5.56 A3 Flat Top Stripped Upper Receiver ACC0024 $69.99 Buy Now AR-15 .223/5.56 Complete Bolt Carrier Group ACC0022 $99.99 Buy Now 100rd AR-15 .223/5.56 Korean Drum with Free Pouch DRUM-AR-100 $119.99 Buy Now FIREARMS AMMUNITION MAGAZINES ACCESSORIES TACTICAL GEAR SURPLUS You are receiving this email to keep you informed of news, products and specials from Centerfire Systems.  Centerfire Systems is not responsible for any typographic errors or misinterpretations. Prices and offers are subject to change. Some products are not legal for sale or use in certain locations. See regular shipping information and restrictions at CenterfireSystems.com.