17 Design Billet AR-15 Stripped Lower Receiver - Black

Manufactured by 17 Design & Mfg.
SKU: 17-17D-00-NFDLAR15-1
MPN: 17-17D-00-NFDLAR15-1
Manufactured by 17 Design & Mfg.
110 Reviews
$69.77 $129.99

Out of Stock

Items that are regulated by the ATF have restrictions and requirements: 
•Your entire order will ship only to a Federal-Firearm License holder.
•Please contact your local FFL prior to placing your order to ensure they are still accepting transfers.
•A copy of your order/invoice as well as the current FFL license for your local dealer must be emailed to ffl@primaryarms.com.



Start your next AR-15 build with this Mil-spec black anodized billet AR-15 aluminum receiver! This AR-15 stripped lower is made in Oklahoma City, OK by 17 Design and Manufacturing, a company that equips military and law enforcement with small and medium machining capabilities as a contract manufacturing and engineering focused shop. Now they are selling billet lower receivers to the public.

  • Mil-Spec dimensions
  • Machined from a billet of 7075-T6 aluminum
  • Stripped
  • Black hardcoat anodized
  • Integral trigger guard
  • Threaded bolt catch roll pin

Save money by building your own rifle from parts. Learn about how the firearm functions by assembling it yourself. Hand pick each component to suit your precise needs. 

Accuracy in machining is crucial to ensure your receiver will be compatible with parts from other manufacturers. 17 Design and Manufacturing has razor thin tolerance levels and personally oversees the development, design and machining of every part that comes off the line. They're not like every other manufacturer. 

Whether you're stocking up for a rainy day or looking to get started on your next build, grab one of these billet stripped lowers while supplies last!
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Brand17 Design & Mfg.
Caliber MarkingMulti-Caliber
Receiver Material7075-T6 Aluminum
Trigger Pin DiameterMIL-SPEC .154

Excellent Billet Receiver; Value Price


No connection with 17 Design, just a satisfied purchaser. 1) Expertly manufactured billet receiver. Crisp edges, no machine marks, mil-spec pins fit all openings smoothly without wobble or play. Smooth finish 3) Flared mag well, fits every mag I've tried without rattles Threads cut correctly - mil-spec buffer tubes screw in snug. 4) Oversize integral trigger guard. Large enough for gloved Shrek fingers, nice appearance, no pins to drive & risk fubaring appearance 5) Screw-in bolt catch pin. Even more important as to not risk scarring lower 6) Fits mil-spec uppers closely with no binding or gap. Tension pin included, not needed. Overall: Combines manufacturing quality & benefits: Flared mag well, integral trigger guard, precise fit to std. uppers. Superior lower @ any price. Buying more.

stripped billet lower

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very pleased with this lower. fit and finish is excellent and looking forward to completing this lower build. love dealing with primary arms!

No issues on mine


I bought two of these and recently built them out. Zero issues with anything. I've built six or seven billet lowers from Mega and Seekins and didn't notice a difference with the 17 Designs compared to them. 5 out of 5.

Absolutely the best


Couldn’t of asked for a more seamless fit. 10/10 on everything possible.

Threaded bolt catch roll pin

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I am very pleased with my Lower Receiver and excited to start and finish my first build. I gave the product 5 stars but my only is with regards to the Threaded bolt catch roll pin. My fault, I forgot it was threaded and struggled to remove. It would have been nice if the product came with "instructions" warning that the roll pin is not the conventional roll pin. Also, I managed to remove the threaded roll pin but could not find the correct tool to remove with the exception on a needle nose to grab the pin from within. Once the bolt catch is in place, you cannot use the needle nose. I was able to thread this back in and then a micro-screwdriver was able grab it enough to thread it the rest of the way in. I still don't know what the correct tool would be to remove or re-install. Otherwise, I am happy with the Lower Receiver.

Good brand. Good material. Easy process.

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Good brand
<br>Good material
<br>Easy process
<br>Faster than expected delivery

Great, for the price

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So, it kind of appears that 17 Design Contracted Critical Capabilities to produce Billet Lowers. These are almost identical to New Frontier Armory or Joe Bob's Spartans, bothe, Critical Capabilities. Dimensionally perfect at a very reasonable price. In case you familiar with most Billets these use a long shank 6/32 hex socket screw for the Bolt Latch pivot instead of the traditional Spring Pin ("roll-pin"). However, unlike most Billets, these are not tapped for a 6/32 hex socket screw for retain the Safety Selector detent and spring. Easy enough to do yourself.


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Great lower, love the Allen head pin on the bolt catch slot

Very Nice!

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This is a very nice lower at a very good price! Finish and machining are excellent and everything installed without a hitch. I love how quickly PA processes and ships orders!

17 Designs Billet Lower

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A very nice looking product that works perfectly with the BCM upper I purchased it for. The threaded in pin for the bolt catch is a nice touch. The gap where the bolt catch installs is not. It is too wide and this creates a lot of room for the bolt catch to wiggle. I don’t think it will affect function but it just isn’t what you expect to get when you order. If it weren’t for that one detail, I would have given it a 5* review and ordered a couple more. But as it stands, this is a 3* item. I am somewhat disappointed in this purchase.