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Questions & Answers
What is the difference between the two that you are showing besides the price?

Depending on which type of upper receiver you have, they will have slightly different sizes. The Aero model is slightly smaller than the DPMS version. According to Cross Armory’s website:
Depending on your build, you will need to choose between the AERO & DPMS variations. Please see instructions below on how to measure when choosing between AERO and DPMS if you do not see your model listed here:
The AERO variation will work on the following models: Aero Precision, Anderson AM10, Armalite A4, Christensen DMR-10, Christensen CA TAC 10, Lewis Machine Tool (LMT), M&P 10 (needs extra spacer, please ask for in notes at checkout)
The DPMS variation will work on the following models: Alex Pro 308, Bushmaster BR 308 (may need fine tuning), CMMG MK-3, DPMS LR308, Fulton Armory 308, Jugernaught Tactical Lower, Noveski N6
HOW TO CHOOSE BETWEEN AERO & DPMS
Determine the width of the base of your upper receiver:
Separate your upper and lower receiver.
Use calipers or measuring tape to determine the width of the base of the upper receiver (measure are of base directly above the trigger)
If the upper width at the base is 7/8″ or 0.875″, choose Aero. If the upper width at the base is 1 1/4″ or 1.25″, choose DPMS.

by Jack, Verified Owner, July 20, 2021
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Product Info for Cross Armory Safe Magazine

Cross Armorys SAFE MAG is a modification, designed in California, for weapons in regulated states that require fixed magazines. The Cross Armory SAFE MAG works by releasing your magazine instantly when you separate the upper and lower receivers of your AR-15 or M4, without having to press a button.image

Cross Armorys SAFE MAG is intended to be consistent with the fixed magazine laws which state that your weapon must have a fixed magazine which has been defined as an ammunition feeding device contained in, or permanently attached to, a firearm in such a manner that the device can not be removed without disassembly of the firearm action. The firearm action of an AR-15 and M4 is housed in the upper and lower receivers. Separating the upper and lower receiver to release your magazine disables the firearm action.

Cross Armorys SAFE MAG also allows for insertion of a new magazine when the upper receiver and lower receiver are closed, without bending or stressing the hardware of the weapon or of SAFE MAG.

Cross Armorys SAFE MAG is a reliable, durable and easy-to-install magazine release. When paired with the Cross Armorys QUICK PINS, magazine changes can be performed efficiently and with a minimum of inconvenience to the user.

Specifications for Cross Armory Safe Magazine:

Manufacturer: Cross Armory
Gun Model: AR-15
Model Generation: 5, 4, 3, 2, 1
Finish: Anodized
Fabric/Material: 7075-T6 Aluminum
Gun Type: Rifle
Weight: 2 oz, 3 oz
Condition: New
Projectile Caliber: .308 Caliber
Quantity: 1

Features of Cross Armory Safe Magazine

  • Fixed magazine locking system for all .308 and AR-10 and MIL-SPEC AR-15 and M4 rifles
  • Automatic Magazine Release when upper and lower receivers are separated, no need to push a button
  • QUICK and SAFE fixed magazine release device
  • SAFE MAG .308 prevents the removal of the magazine from your .308 or AR-10 rifle without disassembly of the action when properly installed
  • QUICK, EASY installation
  • RELOAD EASIER when separating the upper from the lower receiver

Package Contents:

  • Cross Armory Safe Magazine

Cross Armory Safe Magazine Orderable Models

List of Orderable Models

Cross Armory AR-15/M4 Safe Magazine, Black, Small, CRSM , MPN: CRSM , UPC: 649070877268 , Code: 32E-MRC-CMNB-CRSM
Cross Armory AR-10 Safe Magazine 308, Aero, Black, Small, CRSM308A , MPN: CRSM308A , UPC: 653078097351 , Code: 32E-MRC-CMNB-CRSM308A
Cross Armory AR-15/M4 Safe Magazine, Anodized, Red, Small, crSMrd , MPN: crSMrd , UPC: 791109634660 , Code: 32E-MRC-CMNB-CRSMRD
Cross Armory AR-10 Safe Magazine 308, DPMS, Black, Small, CRSM308D , MPN: CRSM308D , UPC: 653078097368 , Code: 32E-MRC-CMNB-CRSM308D

Cross Armory Safe Magazine Unavailable & Discontinued Models

List of Unorderable Models

USED Cross Armory AR-15/M4 Safe Magazine, Black, Small, CRSM, EDEMO2, Used, Condition Like New, Inspect and Rebox , MPN: CRSM-EDEMO2 , Code: 32E-MRC-CMNB-CRSM-EDEMO-RE-A
USED Cross Armory AR-10 Safe Magazine 308, DPMS, Black, Small, CRSM308D, EDEMO1, Used, Condition Fair, Installed/Mounted , MPN: CRSM308D-EDEMO1 , Code: 32E-MRC-CMNB-CRSM308D-EDEMO-IN-D
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