Elite Tactical Systems SIG P320 Extended Magazine 9mm - 21 Round

Manufactured by Elite Tactical Systems
SKU: SG9-320-21
MPN: SG9-320-21
Manufactured by Elite Tactical Systems
1 Review

In Stock

NOTE: Limit 10 per household. Quantities exceeding 10 will not allow checkout.

Standard orders will ship out within 2 business days or less. FFL orders will ship within 5 business days or less as long as we have the information for the transfer destination.

Magazines considered High Capacity are controlled by the ATF and/or local jurisdictions are not available for purchase/shipment in all areas.



Elite Tactical Systems makes a variety of magazines for all your favorite firearms including the SIG P320. This P320 magazine features an extended 21 round capacity of 9mm. It features a durable clear polymer construction that is impact, chemical, and extreme temperature resistant. The base plate is easily removable and is compatible with the ETS line of 9mm double stack baseplates. The feed lips are built to withstand being fully loaded for long periods of time without bending or breaking. The ETS Group P320 full size 21 round magazine is reliable and affordable, so you can stock up on multiple for the range.

  • 21 round extended
  • Clear polymer construction
  • Compatible with aftermarket Glock extensions
  • Interchangeable baseplates
  • Easy to disassembly
  • Impact, chemical, and temperature resistant
  • Durable feed lips
  • Lifetime warranty

ETS Group, or Elite Tactical Systems, is a manufacturer of polymer magazines for highly common firearms like the AR-15 and Glock to less common firearms like the MP5 weapon system.
See More


BrandElite Tactical Systems
Caliber Gauge9mm Luger
Magazine Capacity21
PlatformSIG Sauer Magazines

Ratings & Reviews

1 review

  • 5 stars
  • 0 reviews
  • 4 stars
  • 0 reviews
  • 3 stars
  • 0 reviews
  • 1 star
  • 0 reviews

Just meh...

by -

These magazines are not great, they're ok. They should have reinforced lips/bodies, the follower can get stuck in the body if the rounds stack incorrectly (I had to disassemble a 17 rounder at the range), and the magazines tend to bulge at any load and must be pulled out of the mag well and inserted with some manipulation (pretty sure b/c the magazines bulge the mag walls will start getting thinner w/ repeated use so maybe it'll get better).
<br>Primary Arms however, has never let me down, top notch service even during these crazy times! Thanks a bunch!
<br>We are happy to have spoke to you about this issue and please let us know if there is anything else we may help you with.