If you are looking to build a new rifle or simply a complete upper, you will definitely want to take a look at this new package option from Aero Precision. They are offering their M4E1 Upper Receiver with their own barrel nut, and three handguard styles in a variety of lengths. The handguard mount is forged into the receiver. With this arrangement and their proprietary barrel nut, you don't need to time for the nut for the gas tube port. Simply torque your barrel to spec and you are good to go.
|M4E1 Upper Receiver and Enhanced Keymod Handguard Combo|
The handguards offered include Quad Rail, KeyMod, and Magpul's New M-LOK Attachment Systems with some additional great features. To top things off, you can choose between six different finishes. Given the dozen handguard lengths with the three rail options, and six finish combos, there are well over 400 combinations or I just multiplied wrong, but you get the point. Aero Precision uses quality materials and great quality control. Check out the full specs and ordering details at AeroPrecision.com