.204 Ruger® K16 Style Upper Receiver. M4 feed ramps. Free FedEx Option* (0) AIMSHOT BORE SIGHT .204 RUGER $ 18.64 (2) Caldwell 397488 AR-15 Mag Charger 223 Rem,556,204 Ruger 50rd $ 48.18 (0) Beretta LC 204RUG 20 Black Synthetic 4 $ 611.00 (1) Savage 12 LR VARMINT 204 … R. rth1800 Two Star General. We now upgraded this upper to our own Billet receiver with forward assist and port cover. No other modifications to your AR-15 rifle is required - uses your standard 5.56 BCG, Charging Handle and magazines. Add to Wish List Add to Compare. Sub MOA prairie dog whacker out to 300 yd.s . It is ideal for varmint and small game hunting, because it is … Right up there with a first rate bolt gun. 18 inch AR-15 450 Bushmaster Mid Length M-LOK Upper . 20" 204 Ruger Stainless AR15 Upper Assembly 1x12 Extended Rifle Length Rail *Milspec forged aluminum upper receiver with forward assist and dust cover assembly installed. +1 on Accuracy Systems Inc. .204 Ruger I have the 24" bull and it's been great for prairie dogs and predators Mine likes the 32 grain Hornady V-Max factory loads better than the 40 grain ones AR-15 Conversions from Accuracy Systems Inc. .204 Ruger in a Shilen barreled AR15 upper. Oct 4, 2013 #3 I have had 3 AR rifles in .204 R. The first two were Les Baer 26" heavy varmint rifles. Uses standard AR Bolt and Magazine. .223 Wylde, 7.5" Parkerized M4 Barrel, 1:7 Twist, Pistol Length Gas System, 7" MLOK Rail|Upper (Billet Upper Receiver) Sku: 317-UA223WPM47.517PBUR-7M3 Special Price $361.99 was $470.99 Forged from 7075 T6 aluminum. Hand Guard Options: Seekins MCSR or YHM TJ 12 inch upgraded hand guard. Sep 16, 2009 7,847 3,712. AR-15 .204 20" Diamond Complete Upper Receiver is your next generation varmint long range build. The .204 Ruger is the highest velocity AR-Rifle cartridge and a devastating varmint and small game round. Rating: 94%. K16-204UR: 16in. This cartridge can easily achieve velocities over 4000 FPS with factory ammunition. Rock River Arms, Inc. offers a complete line of American made, custom built AR15 style rifles. Both shot amazingly well. Out of stock. Special Price $379.99 Regular Price $399.99. Matte black hard coat anodized Mil 8625 Type 3 Class 2. Howa ATIM5R223REM Ammo Boost 223 Rem,204 Ruger 5rd Detachable $ 48.81. All you need is this up.. 204+ruger+upper Upper 223 Ruger 556 upper. Lilja barrel in 1-12" twist. The Mercury Vapor IIA 204 Ruger Varmint Upper. 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