Shadow Systems SS-1306-B MR920 Foundation 9mm Luger 15+1 4″ Black Nitride barrel, Black Nitride Optic Ready/Serrated Slide, Black Polymer Frame w/Beavertail & Picatinny Rail, Ambidextrous, *Blemished
- Firearms ship to the FFL dealer you choose, in any state
- Free shipping on orders over $99 · ships in 1–2 business days
- 30-day returns on unused parts and accessories
About this product
The Shadow Systems SS-1306-B MR920 Foundation 9mm Luger 15+1 4″ Black Nitride barrel, Black Nitride Optic Ready/Serrated Slide, Black Polymer Frame w/Beavertail & Picatinny Rail, Ambidextrous, *Blemished is a compact, multi-role pistol that delivers proven reliability at a price that makes sense. It fits G19 Gen4 holsters and ships with two Magpul magazines. This blemished model offers the same performance as the standard MR920 Foundation, with only cosmetic imperfections that don’t affect function.
| Manufacturer | Shadow Systems |
|---|---|
| Model | SS-1306-B MR920 Foundation |
| Material | Black Nitride barrel, Black Nitride Optic Ready/Serrated Slide, Black Polymer Frame w/Beavertail & Picatinny Rail |
| Compatibility | Glock 19 Gen4 holsters (per manufacturer specs) |
| Finish | Black Nitride |
| Weight | Approximately 22 oz (unloaded, per manufacturer specs) |
| Condition | Blemished (cosmetic only; fully functional) |
Key Features
- Black Nitride Barrel & Slide – The black nitride finish provides superior corrosion resistance and a low-glare surface. Why it matters: This means your pistol stays reliable in wet or humid conditions, and the finish won’t wear off quickly, even with daily carry.
- Optic Ready, Serrated Slide – The slide is pre-milled for popular red dot optics and features aggressive serrations for positive grip during slide manipulation. Why it matters: You can mount a red dot without sending the slide to a gunsmith, and the serrations make slide racking easier, especially in stress or with wet hands.
- Ambidextrous Controls – Includes ambidextrous slide stop and magazine release. Why it matters: Makes the pistol equally accessible for left- and right-handed shooters, so it works for you and anyone else who might need to use it.
- Beavertail & Picatinny Rail – The frame includes an integrated beavertail to prevent slide bite and a Picatinny rail for mounting lights or lasers. Why it matters: You get a higher grip for better recoil control, plus the ability to attach a weapon light for low-light defense.
- Blemished Price, Full Performance – This is a factory blemished model, meaning the cosmetic imperfections don’t affect function or reliability. Why it matters: You save money without sacrificing the performance you expect from a Shadow Systems pistol.
Who It’s For
This pistol is for the shooter who wants a compact, reliable 9mm for everyday carry or home defense without paying full retail. It’s also for the new gun owner who needs a pistol that’s easy to operate, optics-ready for future upgrades, and fits most Glock 19 holsters. The blemished price makes it an ideal first pistol or a budget-friendly addition to a collection.
Pros & Cons
| Pros | Cons |
|---|---|
| Optic-ready slide saves on gunsmith costs | Blemished finish may have visible marks – cosmetic only, but some buyers prefer perfect looks |
| Ambidextrous controls for all shooters | Does not include a red dot optic, so you’ll need to buy one separately |
| Fits most Glock 19 holsters and magazines | Magpul magazines are reliable but not as durable as OEM Glock mags for hard use |
| Aggressive slide serrations for positive grip | Trigger is serviceable but not as refined as aftermarket options |
Comparison: Shadow Systems MR920 Foundation vs. Zev Technologies OZ9 vs. Agency Arms G19
| Feature | Shadow Systems MR920 Foundation (Blem) | Zev Technologies OZ9 | Agency Arms G19 |
|---|---|---|---|
| Price | $558.26 (blemished) | $1,100+ | $1,200+ |
| Slide | Black Nitride, serrated, optic-ready | Stainless or black DLC, optic-ready | Custom cut, optic-ready |
| Frame | Polymer w/ beavertail & rail | Polymer w/ steel chassis | Polymer w/ stippling |
| Barrel | 4″ Black Nitride | 4.5″ threaded, stainless | 4.02″ stainless |
| Magazines | Two Magpul 15-round | Two Zev 17-round | Two OEM 15-round |
| Warranty | Limited lifetime (per Shadow Systems) | Limited lifetime | Limited lifetime |
FAQ
Is the blemished finish noticeable?
Yes, you may see small marks, scratches, or uneven coloring on the frame or slide. These are cosmetic only and do not affect function or reliability. According to Shadow Systems, all blemished models are factory-tested and meet their performance standards.
Will this fit my Glock 19 holster?
Yes, the MR920 Foundation is designed to fit most Glock 19 Gen4 holsters. However, if your holster is tight-molded to the G19 trigger guard, you may need a little break-in. Most owners report a snug but functional fit.
What red dot optics will fit this slide?
The slide is milled for the RMR footprint, which includes Trijicon RMR, Holosun 407C/507C, and similar optics. You can also use adapter plates for other footprints. Per Shadow Systems, the slide is pre-milled to accept most common red dots without additional work.
Does it come with a case and lock?
Yes, the pistol ships in a Shadow Systems branded case with a cable lock, two Magpul magazines, and a manual. Everything you need for transport and storage is included.
Is the trigger good for self-defense?
Yes, the trigger is a flat-faced design with a crisp break and short reset. It’s suitable for defensive use. According to Shadow Systems, the trigger pull weight is around 4.5-5.5 lbs. Some shooters prefer a lighter trigger for competition, but for carry or home defense, this trigger is reliable and predictable.
✓ Nationwide delivery (all 50 states)
✓ Ships 1-2 business days
✓ 30-day returns
✓ Secure checkout
Explore more handguns in our Semi Auto Handguns collection, or check out Blemished Deals for more savings. Also look at Concealed Carry Pistols for other compact options.
Last updated: April 2026