- M-LOK Handguards
- M-LOK Accessories
- KeyMod Accessories
- Barrels
- Bolt Carrier Groups
- Charging Handles
- Complete Kits
- Gas Blocks
- Gas Tubes
- Iron Sights
- Lower Parts
- Mags
- Muzzle Devices
- Pistol Stock Sets
- Pistol Grips
- Pistol Accessories
- Slings
- Stock Components
- Stocks
- Stock Sets
- Stock Sets With Matching Upper
- Tools
- Upper Kits
- Upper Parts
- Upper Receivers
- Upper Sets
- Vertical Grips
- US Made
- Stick Magazines
- Lightweight
- All Aluminum Body With Steel Inserts
- Insert Converts Standard 5.56
- Accepts Colt Style SMG Mags
- Does Not Accept Glock Mags
- Installs By Inserting In Bottom Of Standard Lower
- Lower Receivers To Accept 9mm
- Bolt Hold Open On Last Shot
- One Retention Screw On Top Of Adapter and Two Set Screws That Lock Into Wall Of Magwell.
- Anodized Matte Finish
Cecil Crawford –
Purchased the AR-15 9mm Magwell Adapter Block from tacticaltransition.com, and it’s been a welcome upgrade for my build. Even though it’s marked as discontinued, I can honestly say it’s a piece that stands out in quality and design. The machining on the adapter is precise, with tight tolerances that fit my AR-15 platform perfectly—no rattling or looseness whatsoever. It feels solid and well-crafted, indicating that it’s built to last and withstand the rigors of tactical or range use.
What I particularly appreciate is how straightforward the installation was. The instructions were clear, and the hardware provided was sturdy and reliable. Once installed, the magwell adapter gave my setup a much cleaner, more streamlined look, and my 9mm magazines lock in securely—no wobbling, which can sometimes be an issue with less premium adapters. It’s a tangible upgrade in terms of handling confidence and reliability.
This adapter is an excellent choice for anyone looking to run 9mm in an AR-15 platform, especially if you’re into quick magazine changes or want a reliable magwell. The design also helps with feeding and minimizing jams, which is especially important during rapid-fire sessions. Even though it’s discontinued, I can see why previous buyers rated it highly—quality, fit, and function all meet high standards.
The only downside is that since it’s no longer in production, finding a replacement or spare might be tricky if you want to build multiple setups. That said, it’s still available through secondary sources, and in terms of value, it offers good performance at a reasonable price point in the current market.
Overall, I’d definitely recommend this AR-15 9mm Magwell Adapter Block for anyone serious about their 9mm AR builds. It’s a well-made, reliable component that enhances functionality and gives confidence during shooting. If you’re able to find one, it’s worth grabbing before they’re truly gone.
Gray Webber –
This AR-15 9mm Magwell Adapter Block has genuinely impressed me since I added it to my setup. Even though it’s a discontinued item, the quality and craftsmanship are still evident in its design. The machining is precise, fitting seamlessly onto my AR-15 platform without any wobble or play, which really enhances confidence during rapid reloads. It’s impressive how sturdy and well-constructed it feels—solid enough to withstand rigorous use without any signs of wear.
The installation was straightforward, thanks to clear instructions and well-made hardware. It’s designed to be as minimalistic as possible, yet it manages to provide a robust connection that improves reload times and overall handling. The material seems to be high-grade aluminum, offering durability without unnecessary weight. This is particularly helpful if you’re balancing weight for extended shooting sessions or tactical drills.
What I appreciated most is how this adapter eliminated unnecessary fuss when switching between different calibers or configurations. Since it’s designed specifically for 9mm AR conversions, it fits my needs perfectly, giving me that quick swap capability without sacrificing reliability. While it’s interesting to note that it’s no longer in production, I feel this gives it a bit of a collector’s appeal, especially for those who value well-made, discontinued parts for their unique collection.
Considering the price point, the quality-to-value ratio is quite good. It’s a component that elevates the overall functionality of my rifle, especially in a competitive or tactical context. It’s always reassuring to invest in gear that’s tested and proven to enhance performance, and this adapter delivered on that promise.
Overall, if you can find this AR-15 9mm Magwell Adapter Block, I’d highly recommend it to anyone looking to upgrade their AR-15 for 9mm caliber use. It’s a reliable, well-made piece that I’m happy to have in my arsenal. Though it’s discontinued, its capability and build quality make it a worthwhile addition for serious shooters who want consistent, fast reloads and dependable performance.
patrickhealy91 (verified owner) –
Got this to replace a pro-mag adapter. I didn’t like they idea of having to remove the bolt catch to remove/install it. This guntec adapter works great! Not one issue at the range. Bolt held open like it should after the last round. I definitely recommend this to anyone who wants to use colt mags.
John (verified owner) –
Have this adapter mounted in a PSA lower combined with an AR Stoner 16″ carbine upper and performed flawlessly. Put 200+ rounds of 115gr FMJ, 124gr FMJ, and Federal 147gr HP using ASC and AR Stoner mags. Have a couple of promag 25rd mags and they are much too tight and will not latch in the magwel.
Also have a 10.5 pistol build using a PSA lower using Endomags. Lots of jams! Mounted the Guntech adapter in the pistol and it ran great.l, no problems.
Nathan Comstock (verified owner) –
Mags are a bit tight and don’t drop free, but other than that it seems to work as advertised
David –
Anyone know is this will work with Glock mags.?
Mark (verified owner) –
I used this adapter in an AR pistol build on a James Madison tactical polymer lower, a standard milspec forged upper with Kaw Valley Precision AR-15 9mm BlowBack Bolt Carrier Group, A Ballistic Advantage barrel and KVP 7.5 oz buffer and heavy spring and Duramag steel magazines. It was my first 9mm build and I was apprehensive given everything I have heard and read on various forums about how finicky 9mm conversion builds can be. The Guntec adapter is made well and fit in well and once the set screws were tightened down, felt solid as could be. Mags slid in perfectly and dropped smoothly when mag release pressed and dummy rounds loaded and ejected fine. So I was cautiously optimistic when I went to the range for field test. I could not have been happier – it ran flawlessly from the first round. LRBHO functioned perfectly. I only had time for maybe 100 rounds but did not have a single issue. I was using FMJ Winchester white box. Will have to try other ammo the next time. Bottom line – I would not hesitate to use the guntec adapter – great product at a decent price compared to other adapters.
roy robles jr (verified owner) –
Perfect! Not one problem….buy it !
James keatts (verified owner) –
I replaced a faulty pmag adapter with this one and it works flawlessly. The customer service was great and I will be using Tactical Transition again
Joe P. (verified owner) –
On an AR pistol build, using a new Anderson lower receiver, my old magazine adapter would not fit in the receiver. Now, I had used this magazine adapter in a couple of other builds, and had to do some filing to get it to fit in another receiver, but there is no way it was going in the Anderson. A little online research it seems I wasn’t the only one encountering this problem with the Anderson lowers. Took a chance, ordered this adapter, and it slid in with just a little plastic mallet assist for the last 1/4″. My mags lock in, the dummy rounds cycle fine. Can hardly wait to finish this build and get out to the range!
Chris (verified owner) –
Great product works like it should Cokt Stickmag’s work perfect And last round hold open Works every time.
Ryan (verified owner) –
Works great after I adjusted the extractor, ar-9’s can be finnakey. From my experience after building my first 9mm ar-15, make sure you get your BCG and buffer wait to 22-24 ounces. And get a longer buffer unless u want to add a spacer
E.R.D. (verified owner) –
Perfect fit and function, very happy with the product. The only slight issue which is not the products fault is the magazine catch fitment. The magazine catch because of the additional thickness of the adapter does not protrude far enough into the magazine. This was a simple fix, I just filed off a few thousands off of the the inside portion of the magazine catch arm to let it sit deeper into magazine well. I’m glad I chose this product because I didn’t want a dedicated 9mm lower but was concerned about bad reviews for other adapters but this one is great.