17 Design Billet AR-15 Stripped Lower Receiver - Black
- Mil-Spec dimensions
- Machined from a billet of 7075-T6 aluminum
- 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!
Ratings & Reviews
Solid Billet Lower
$130 for a billet lower?? Why so cheap??
<br>Took a chance and bought it without much info available on it. It locks up to all my BCM and Aero uppers nice and tight. Screw in bolt catch and tension set screw (it's there, just didn't need it). No visible machine marks, smooth finish and everything seems to be in spec. There's no safety Select stops which threw me off at first but it aids in the appearance of it. Luckily these are always in stock so if I decide I NEED another lower I can pick one up.
Great billet lower for the price!
Couldn't be more pleased with this lower. Can't beat the price for a billet lower, I will be ordering more!
Nice Billet Lower
Nicely machined. Nice finish. Low price point for a billet lower. Married nicely to an Aero Upper; no need to adjust the lower tension screw. A threaded bolt catch with a set screw eliminates the need to tap in a roll pin. Suggest using an enhanced magazine release button due to the extra wall thickness of this billet lower. Other websites indicated some QC issues that apparently have been worked out.
17 Design Billet - nice, very nice
by JDubskiNC -
These are very nice lowers, I’ve put dozens of lowers together from all different manufacturers. Got to say, the threaded bolt release pin is a great idea. The rest went together without any issues. Finish is nice too. Scores a 10 out of 10 for me.
Excellent lower. Worth the cost.
by Old Tex
This lower is Excellent. Precisely made, high quality, everything in spec. AND the only lower I found with a nicely flared mag well, integral trigger guard (oversize for gloved hands) and and a captive bolt catch pin - no tiny roll pins to pound in.
<br>Built a DMR with an 18" 1/8 HB upper, quality parts kit and match trigger. The upper fit precisely with zero daylight and no play. Thx for the stimulus check, new administration. Putting it to good use!
Better than Aero Precision
by Kyle -
I bought this because I assumed that all of the reviews, even if exaggerating, it had to be half decent. Turns out they weren't exaggerating. This lower is beautiful with hard edges and matched up to my Aero Upper perfectly. No slop, no play, all business. The raised side only somewhat interferes with my phase 5 extended bolt catch, but after all assembled, its not to bad. Just a little break in wear required. I originally didn't want to write another good review as I want these to stay available. I have a go to for my next 300BO pistol build.
by Peter Scott -
Excellent quality. Made for a smooth build.
17 design billet lower
by William -
High quality lower excellent fit and finish
by Ben R
Really impressed with the quality of these, billet upper with a threaded bolt catch pin and integrated trigger guard for $130. No tooling marks anywhere, everything looks top notch. Also has the nylon tipped screw for adjusting any play with lower and upper receivers, although I don't think it will be needed.
Quality Billet Lower
Took a flyer on this lower as it was in stock, it was billet and at a great price. This did not disappoint. All millspec assembly parts went in perfectly, it functions great and the fit and finish is excellent. Will buy again for sure. Well done.
Excellent Billet Receiver; Value Price
by Olman & Moody
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
by HY -
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
by Nunu -
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.
by Joe -
<br>Faster than expected delivery
Great, for the price
by 1911rocks -
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.
by Dillon Jones -
Great lower, love the Allen head pin on the bolt catch slot