A3 Industries
Stribog Polymer Lower
Stribog Polymer Lower
SKU:REC-100-P
Fits these firearms:Grand Power Stribog
Couldn't load pickup availability
Specifications
- Weight: 0.62 lb
- Country of origin: USA
Product Description
NOTE: ONLY COMPATIBLE WITH 9MM STRIBOG'S
A3 INDUSTRIES LOWER
The A3 Industries lower is designed to use the popular and well established AR triggers, selectors, and grips. These AR features bring almost limitless possibilities to your Stribog platform, allowing the user to customize the Stribog to suit their individual tastes and shooting preferences.
Additionally, this lower is designed to use the widely trusted CZ Scorpion magazine rather than the original Stribog magazine. The Scorpion magazine has a proven track record of delivering more consistent feeding and generally performs more reliably across a wider range of ammunition types and brands.
NOTE: Not recommended for use with aftermarket buffer kits or short-stroke kits
NOTE: Single-stage triggers only. 2-stage triggers will not reset properly in the Stribog
NOTE: ONLY COMPATIBLE WITH 9MM STRIBOG'S
Lowers ship complete with a hybrid machined aluminum/hardened steel bolt release lever, A3 Industries TRI-Lever polymer mag release, new bearing detent takedown pins, new 1/4" grip screw, and a selector detent with spring. Lower is manufactured from injection-molded Zytel polymer with 30% glass reinforcement.
A3 INDUSTRIES BOLT RELEASE LEVERS:As of Fall 2025 every lower now ships with our upgraded machined aluminum bolt release lever. These levers are machined from 7075 aluminum and then hard coated low-gloss black. They have a hardened steel insert at the bolt interface and also feature textured thumb levers.
MAG RELEASES:
The lower ships with an A3 Industries Polymer TRI-Lever mag release. These are injection molded from Zytel Polymer with 30% fiber reinforcement.
BALL DETENT TAKEDOWN PINS:
Lowers ship with new ball detent steel takedown pins, allowing the user to leave their factory lower fully intact, with no need for disassembly.
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MAGAZINE INFO and COMPATIBILITY:
During the development of our lower, we evaluated multiple magazine well angles to identify the configuration that delivered the most reliable feeding across the widest range of magazines. In addition to angle, we determined that the vertical position of the magazine relative to the bolt is even more critical to proper function. The Stribog is particularly sensitive to both of these factors, which can present challenges given the variations in design and dimensions among different magazine manufacturers.
In contrast, the Scorpion is designed with more flexibility. Its ejector sits higher, and the bolt has more clearance around the magazine. This makes the Scorpion system more forgiving, allowing it to function reliably with a wide range of magazine types—even when those magazines differ significantly in size or shape.
BRAND/STYLE
PROS
CONS
PSA 35 ROUND (#1 recommended)
Low price
High quality
Good fit in magwell
Readily available
None
MAGPUL 35 ROUND
Low price
High quality
Good fit in magwell
Readily available
Tallest feed lips which usually requires filing to fit and function properly
LRBHO is temperamental in our lower due to the smaller "finger" Magpul uses on their follower.
ETS 40 ROUND
Highest capacity
Good fit in magwell
Generally will not feed the last 1 or 2 rounds when used in the Stribog
CZ FACTORY MAGS
Low price
Loose fit in magwell
Temperamental functionality due to various changes throughout the years.
MAGPUL, F5, PROMAG 50 ROUND DRUMS
Not compatible
Not compatible
SUMMARY: THE BEST OVERALL PERFORMER IS THE PSA 35 ROUND MAGS. THESE ARE READILY AVAILABLE, INEXPENSIVE, HIGH-QUALITY, AND REQUIRE NO MODIFICATIONS.
This made all the world of difference in performance feeds every type round excellent product I will continue to enjoy and thank you guys for such a great product
This lower is great! Installed on my SPA1. I went with the Magpul PMAG for my magazine choice. And I did have to file down part of it to get it to fit right (as suggested by A3 tactical) I also noticed that it fits better if you only load 30 rounds instead of 35. Not sure why. Maybe it needs to be filed more still? I just didn't wanna overdo it and wreck the magazine. I haven’t got many rounds through it yet but so far so good. It was easy to install. I love the mag release much better than the stock lower. I also bought the suggested rise armament drop in trigger and I love that as well. Super crisp.
The Stribog lower receiver is a well-design piece. Fitment to upper is nice and tight without any slop. CZ Scorpion Gen 2 and PSA AKV magazines worked flawlessly without having to do anything. The lower was completed with Triggertech AR adjustable trigger and Magpul grip for a fantastic setup. The HBi short stroke buffer initial testing seemed to be fine but needs more live fire confirmation before I can attest that it would function 100%. Overall this is a great product and a good buy!
Absolutely love the A3 Tactical Stribog lower receiver! Not only does it look great and function flawlessly, it allows for the upgraded mag and bolt releases, trigger, grip and safety selector of your choice. Phenomenal product and super happy. The Stribog SP9A3S build is now complete!
Hands down the best upgrade that can be purchased for the Stribog platform. No jams, fte, ftf. The magpul mags drop free and DONT brake on the feed lips. I was able to shoot 115 and 124 round and flat nose ammo and Hollow Points no malfunctions of 350 rounds. With the Rise trigger and this lower 10 for 10 at 100 yards at a 6 inch circle with hollow point ammo. Don’t waste time with the OE Stribog mags. Get this lower and use the CZ platform mags and never look back.
This will be my 3rd stribog/Scorpion/AR lower set up and it doesn't disappoint! Super nice fit and finish and this is a must for any Stribog owners. This lower takes the Stribog to a whole different level. Thanks Brett for all the R&D that went into this to make it a awesome mod.
Wow what a difference this made. My Bog runs like a dream.
Glad I bought this lower! I hesitated for way too long on buying this, but I'm glad I finally did. Now I can use my CZ Scorpion mags with this instead of the crappy proprietary mags that come with the Stribog. This lower also takes AR parts, which is great and I used my CMC drop-in trigger. Took it to the range and it ran flawlessly!
Received and went together as advertised and much better design than the original stribog. If I had 1 thing to nitpick, it would be that it was tight as hell going together. Definitely won't be tearing down after every range trip, although there is 100% no slop or wobble , so that's a plus.
The finishing is solid and awesome. I would recommend to any one with a stribog to pick one up.
Seen a few people post about the a3 changing their bog build, it’s all true from the paddle mag releases to AR controls makes the extraordinary price worth it.
Great build quality. Addresses all of the stribogs shortcoming and now I can use scorpion mags on multiple guns!
Great aftermarket lower and a huge upgrade to the Stribogs performance and ergonomic functionality.
-The Lower's build quality is very solid
- PSA MAGS fit like a glove.
- Rise PCC trigger is AWESOME.
Excellent product with quick delivery
Everything arrived in good condition and was installed easily. Unfortunately the package did not come with a safety detent or spring so I had to order those to complete the build. It would have been nice to see it come with those.
Took the Stribog out today for the first time since getting the complete A3 lower and I have to say I’m very pleased with it’s performance. I had no missed feeds or jams and everything worked exactly as it was supposed to, I put about 300 rounds through it no problems at all.
A+ on all levels: Quality of lower is fabulous..mag release, the magazines themselves is much better than the OEM. The trigger is as clean as can be. And, the safety action is crisp. I'm very happy with this upgrade. It was worth the $400 upgrade. Now I'd stack my Bog (A3) up against any PCC.
The purchase was hassle free, but I'm still waiting to receive my item, so can't rate the item yet.
Ordered what seems to be a used return product and the pistol grip was out of spec, tried using a heat gun and gave up after 10 mins. Reached out and they said they would charge restocking fee and i have to pay shipping (basically 30%) to the point a return is useless. Followed up and they never responded.
I highly recommend upgrading your stribog with this!!
I ran six full Scorpion PMAGs through this and got zero jams. Two of them locked back early and didn't fire the last shot. I can live with that and will isolate and correct those mags. by shaving the feed lips. The 20rnd stock mags that came with the Scorpion did not do so well. Avoid those.
Lower is lightweight yet very strong. Looks great and price was right. Fits ETS, PSA, Magpul and factory Scorpion magazines with no issues.
Fit and finish very nice , love using standard AR parts , now use CZ Scorpion
Mags , exactly what I was looking for
I’m just flabbergasted how how much better this makes the Bog. Only issue is that for the price, trigger upgrade and grip upgrade, I could be driving a B&T GHM. This is how my SP9A3 should have shipped. Sweet PCC. What the Stribog was missing.
150 Rnds through it today. 7 PSA AK-V mags, all ran great. LRBHO worked on every mag. So far, so good
Absolutely love it!