We took our uppers a few steps further and opened our ejection port opening to 0.65in instead of the standard 0.62in and we also opened the upper right side for no cycling issues spitting out the big bore brass. For the finishing touches to make this a true big bore upper we blend the feed ramp to aid in the center feed design unlike most that still have the M4 .223/5.56 feed ramps, which is not needed in the 12.7x42(.50 Cal) design. We then sand all openings and edges to remove any burrs to aid in the ejection of the brass. Upper will come as stripped upper only, unless hardware kit option is selected. Hardware kit includes, ejection port door, rod, spring, c clip, forward assist button, spring, and pin. Please add in notes if your prefer hardware package loose or installed by us.
Please make sure to list your Cerakote color in box before adding to cart (see color chart in pictures for color choices), If nothing is listed you will receive Graphite Black Cerakote for your upper and lower. Please allow 1-2 weeks, possibly sooner for standard Cerakote colors. We also offer Sandblasted Upper and 80% Lowers here.
• Larger ejection port opening
• Blended center feed ramp
• Hand smoothed and inspected
• All casting ugly casting marks are sanded smooth
• 7075 Aluminum
• T6 Heat Treated
• 80% Machined Lower (just needs trigger and safety well machined)
• Optional Engraving
•Magwells are flared and broached for ease of magazine swapsYour options for Cerakote are 1 color of Cerakote, 2 Color Battleworn, 3 Color Cerakote Stencil, or 5 Color Cerakote Stencil. If you are selecting one of the stencil options please be sure to select which stencil pattern you would like.
• Optional Engraving (Not available for CA purchases, your CA Compliant Engraving will be there)
• California Compliant Engraving
If you are adding the Hardware (Forward Assist and Ejection Port Door) we can Cerakote those as well. You can have them Cerakoted the same color as the Upper or a different color. If you would like to leave the Forward Assist Black and just Cerakote the Ejection Port Door, please list that in the Special Notes section.
Be sure to list your Cerakote Color(s) in the Cerakote Color section.
Please allow 1-2 weeks, possibly sooner for completion, since these are custom for each order.
You can choose to have the Caliber added to the Warr Dogz engraving or if you would prefer to not have it added.
80% lowers are NOT an FFL item. No FFL is required for transfer and machining, please machine work MUST be done solely by the buyer to keep the ATF from knocking at your door. The only things left to finish this off into a fully functional lower receiver is to mill the trigger pocket, safety selector, trigger and hammer pins. The rear lug pocket is already complete, one less step to worry about.
Feel free to email us with any questions.
*No returns accepted, all sales are final*
***We Have NO affiliation with Alexander Arms, our 12.7x42(.50 Cal) is a Warr Dogz design.***