VIEW MY CART
Ammo by Manufacturer
Firearms by Manufacturer
Gun Gear and Parts
See More ...
See More ...
Bipods, Tripods, Monopods
Ear, Eye Protection
Military Surplus Gear
MOLLE, Tactical Gear
Range Gear, Targets
Self Defense, Police Gear
Speedloaders, Mag Loaders
Universal Gun Parts
Full Store Directory
Find a Dealer
Check Gift Card Balance
to login or create an account.
Click to Sign In
Click here to view a larger image
CMMG, Inc. AR-15 M4-LEP II Complete Gas Piston Upper Receiver .223 Rem/ 5.56 NATO 16" Barrel 1:9 Twist Black Finish 10217
We're sorry, but this product is no longer available.
to be notified by email if this product becomes available.
Gas Piston systems operate cleaner than the direct gas impingement operating systems, because the propellant gases diverted at the gas block are now also vented at the gas block, rather than within the upper receiver. Because the fouling from the gas system is not being vented into the receiver, it stays cooler and cleaner. Our system is designed around the short stroke piston operation. The piston pushes the anti tilt one piece carrier, which unlocks the bolt and allows the piston to return home while the bolt carrier continues to cycle independently. The upper is built off of CMMG's standard forged A3 receiver with M4 feed ramps. The chrome plated gas piston is mounted in a solid one piece steel gas block attached to the barrel by pins. The Gas Block's 1913 Picatinny rail is receiver height and requires a front sight designed to be mounted on the same plane as the rear sight. The dedicated, piston specific, anti-tilt bolt carrier is one piece, machined with the piston impingement key(not a bolt on). The carrier uses our standard Mil-Spec bolt. The barrel is our 4140 steel, M4 profile, 5.56mm chamber and bore, 1:9 twist ratio and 1/2x28 threaded barrel with proprietary WASP surface treatment. The upper is finished with M4 handguard caps, M4 handguards and an A2 flash hider installed with a crush washer. The piston gas block has a gas shut off setting for use with a suppressor to allow for maximum noise reduction. You must replace the crush washer with a peel washer if you plan to mount your suppressor on the original flash hider. Fits on any standard Mil-Spec lower receiver. All uppers have been factory head spaced and test fired.
Specifications and Features:
AR-15 M4-LEP II Complete Gas Piston Upper Assembly
5.56 NATO Chamber (also accepts .223 Remington)
4140 barrel with WASP finish
One piece steel pin-on gas block
Chrome plated gas piston and stainless steel spring
One piece anti-tilt bolt carrier
Forged M4 upper receiver
Can we ship this to you?
Be the first to write a review!
Change Account Information
Order a Catalog
Hot New Items
Join Our E-Mail List
Ask A Question
Mail Order Form
© 2014 Copyright, entire contents by CTD, Inc.
Cheaper Than Dirt! is a registered trademark of Direct Investments, Ltd. All Rights Reserved
This website is best viewed with Internet Explorer 8.0 and FireFox 15.0 with a screen resolution of 1024 x 768 or higher.
CMMG, Inc. AR-15 M4-LEP II Complete Gas Piston Upper Receiver .223 Rem/ 5.56 NATO 16 Barrel 1:9 Twist Black Finish 10217