El Jefe is a Spanish term meaning "the Chief" or "the Boss".
Our 300 Blackout build foundation is the Area53 El Jefe Lower Receiver embodied with all the El Jefe standard features you expect and numerous upgrades to the lower parts group that makes this a shooter you will not want to put down.
The A53 Billet machined 7075-T6 Aluminum lower receiver is extremely rigid and features a unique shooter control grip for the most serious tactical shooter to allow maximum control of the firearm in CQB situations.
We include a lower adjustment set screw allow for a precise lockup between any upper and lower to ensure proper lockup every time. Another standard feature is the trigger reset set screw that allows for exacting trigger adjustments to fit your mission needs.
Another standard feature we provide is an over-sized trigger guard that ensures all season capabilities and hand protection. We also incorporated a long shank set screw in place of the bolt catch roll pin to simplify field maintenance. Magazine changes are a greatly improved for all shooters through the funnel contour introduced by Area53 at the magwell entry.
Lower Parts Kit Upgrades include:
Timney Trigger 4lb Single Stage SkeletonKNS Trigger/Hammer Anti-Rotation PinsRed Highlight Safety Selector (non-ambi)PWS Enhanced Buffer Tube with built-in Flush Cup
This Advanced Armament Corp. AR-15 Upper Receiver Assembly in 300 AAC Blackout can also be swaped to with any legally registered SBR. This is mated with dedicated pistol AR-15 lower receiver. The Mil-Spec 4150 chrome moly vanadium steel barrel comes equipped with 1 in 7" twist rifling, M4 feed ramps, a low profile steel gas block, and is finished inside and out with a protective black nitride treatment for superior durability and corrosion resistance. The muzzle is threaded with a 5/8"-24 pitch for easy installation of a silencer, and is topped off with an effective AAC 51T Blackout flash hider. The upper features a forged M4-style flat-top receiver onto which a Knight's Armament free floating URX III Modular Rail System is rigidly attached. The URX III creates a full length top rail surface when matched with the flat-top upper to accommodate almost any desired sighting arrangement. This customizable handguard allows shooters to attach modular rail sections along its length only where needed for adding accessories, keeping the remainder of the handguard slim, smooth, and snag-free. The heat-treated, full auto bolt carrier is finished in a slick Nickel Boron coating, and comes equipped with a properly-staked gas key and Carpenter 158 steel bolt assembly. This 9" 300 Blackout upper utilizes a pistol length gas system and is compatible with most subsonic and supersonic ammunition, with or without a sound suppressor in place. However, some subsonic ammunition may not always cycle reliably under adverse conditions or in a severely fouled firearm without a sound suppressor attached to provide extra backpressure. Specifications:
IMPORTANT NOTES: -The 9" and 12.5" AAC 300BLK Uppers are designed for use with a carbine receiver extension, standard GI Buffer Spring, and an H2 Buffer. -The 16" AAC 300BLK Upper is designed for use with a carbine receiver extension, standard GI Buffer Spring, and a CARBINE Buffer.
This screen shows you the details for the selected product.
Click the "Add to Cart" button to add this product to your shopping cart. You can enter a quantity larger then 1 to add multiples of this product to your shopping cart.
If the product is full you will see a "Wait List" button. Click this button if you would like to be notified if/when capacity is added. If capacity is increased we will email you. Upon receipt of the increased capacity notification, registration will be on a first-come, first-served basis.
If the product is not ready for purchase you will see a "Notify Me" button. You can click this button if you would like to be notified when this product is ready for purchase.
Some products can only be purchased through our partner. In this case you will see an "External Register" button. Click this button to purchase through our partner's website.