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Magpul MAG577-BLK PMAG GEN M3 Window 7.62x51mm SR2, M110 25rd Detachable Magazine
Our editorial team reviews specifications, product data, and field-use information to keep pages accurate.
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SKU: MAG577-BLK-840815100140
Overview
Built for SR25/M11 pattern rifles, this 25-round polymer magazine is intended for shooters running 7.62x51mm platforms with longer-than-SAAMI-spec match ammunition up to 2.83" overall length. The constant-curve body, anti-tilt follower, and snap-on Impact/Dust Cover are paired with transparent MagLevel windows for a quick check of remaining rounds. It is a practical choice for range use, load development, and field-ready rifle setups where compatibility with the listed platforms matters, while noting that it may not drop free from all lower receivers and is not compatible with several other magazine patterns.
Why Hunters Choose the Magpul
True 25-round
Capacity for SR25/M110 pattern rifles
Transparent Maglevel
Windows show approximate round count
Constant-curve Body
Anti-tilt follower support smooth feeding
Compatible Longer-than-saami-spec
Longer-than-SAAMI-spec match ammunition up to
Snap-on Impact/dust
Cover included for added protection
Key Features
- True 25-round capacity for 7.62x51mm SR25/M110 pattern rifles.
- Constant-curve body supports longer-than-SAAMI-spec match ammunition up to 2.83" OAL.
- Transparent MagLevel windows allow quick visual checks of remaining rounds.
- Anti-tilt follower helps maintain smooth cartridge presentation.
- Snap-on Impact/Dust Cover is included.
- Compatible with select commercial rifles, including Armalite AR-1A and Ruger Precision Rifle.
Best Used For
- Hunters using SR25/M110-pattern rifles with longer-than-SAAMI-spec match ammunition up to 2.83" OAL.
- Users who want a 25-round magazine with transparent windows for quick round-count checks.
- Range shooters needing a constant-curve, anti-tilt magazine for 7.62x51mm rifles.
- Owners of compatible commercial rifles listed in the product data, including Ruger Precision Rifle and SIG716.
- Shooters who prefer a lightweight polymer magazine with snap-on Impact/Dust Cover protection.
Specifications
| Blade Finish | Black |
|---|---|
| Body Style | Constant-curve body |
| Bolt Lock Functionality | Not optimized for bolt lock functionality with newer models based on the DPMS GII design |
| Caliber | 7.62x51mm |
| Capacity | 25 |
| Compatibility | SR25/M11 pattern rifles; commercial rifle compatibility includes Armalite AR-1A, Colt LE91-16S, CORE Rifle Systems CORE3, JP Enterprises LRP-7, KAC SR25, LaRue OBR, Les Baer .38, LMT .38 MWS, LWRCI REPR, Mega Arms MATEN, Noveske Gen III N6, POF P-38, Ruger SR-762, Ruger Precision Rifle, S&W M&P1, SIG716 and others; compatible with older model Bushmaster .38 ORC, Remington R-25, and DPMS LR38 rifles |
| Country Of Origin | USA |
| Drop Free | May not drop free from all makes of lower receivers |
| Dust Cover | Snap on Impact/Dust Cover |
| Follower | Anti-tilt follower |
| Magazine Type | Detachable Magazine |
| Material | Polymer |
| Model | PMAG |
| Model Fit | SR2, M110 |
| Not Compatible With | Armalite AR-1B, Springfield Armory M1A, Rock River Arms LAR8, FN SCAR 17S, PTR-91, HK417, or any other rifles that utilize M14, FN FAL, or HK 91/G3 patterned magazines |
| Oal Compatibility | Up to 2.83" OAL |
| Window | Transparent MagLevel windows |
Pros
- True 25-round capacity for SR25/M110 pattern rifles.
- Transparent MagLevel windows show approximate round count at a glance.
- Constant-curve body and anti-tilt follower support smooth feeding design.
- Compatible with longer-than-SAAMI-spec match ammunition up to 2.83" OAL.
- Snap-on Impact/Dust Cover included for added protection during storage and transport.
- Lightweight polymer construction keeps the magazine easy to carry.
Considerations & Trade-offs
- Designed for SR25/M110-pattern rifles; it is not compatible with several other 7.62 platforms, including M1A, SCAR 17S, HK417, and rifles using M14, FAL, or G3-pattern magazines.
- Built to accommodate longer-than-SAAMI-spec match ammunition up to 2.83" OAL, so fit and function are more specialized than with standard-length 7.62 magazines.
- The magazine may not drop free from all lower receivers, which is a practical consideration for reload speed and handling.
- Compatibility with older Bushmaster .38 ORC, Remington R-25, and DPMS LR38 rifles is noted, but it is not optimized for bolt lock functionality with newer DPMS GII-based models.
Suggested Comparisons
- 7.62x51mm SR25/M110 pattern magazines
- Polymer detachable magazines
- Windowed magazines with round-count visibility
- Magazines for longer-than-SAAMI-spec match ammunition
Suggested Accessories
- Magazine pouch
- Rifle sling
- Ammo storage case
- Magazine loader
Frequently Asked Questions
What rifles is this magazine intended to fit?
It is designed for SR25/M11 pattern rifles and is listed as model fit for SR2 and M110. The product data also names compatibility with several specific rifles, including the KAC SR25, LaRue OBR, LMT .38 MWS, LWRCI REPR, Ruger Precision Rifle, and SIG716, among others.
What ammunition length is this magazine built around?
The product description says it is intended for longer than SAAMI-spec match ammunition up to 2.83" OAL.
Does this magazine have a round-count window?
Yes. It includes transparent MagLevel windows for rapid visual identification of the approximate number of rounds remaining.
Is the magazine a true 25-round capacity?
Yes. The listed capacity is 25 rounds, and the description specifically calls it a true 25-round capacity magazine.
Are there any compatibility limits I should know about?
Yes. It is not compatible with Armalite AR-1B, Springfield Armory M1A, Rock River Arms LAR8, FN SCAR 17S, PTR-91, HK417, or other rifles that use M14, FN FAL, or HK 91/G3 patterned magazines. The description also notes it may not drop free from all lower receivers when used with longer-than-SAAMI-spec match ammunition.