Referenced product: M11-A1-D-10
The 10rd version of the M11-A1 will accept the 15rd magazine (MAG-229-9-15-E2).

Referenced product: O-MAG-229-9-15-E2
These magazines will work in the M11-A1.

Referenced product: MAG-229-9-15-E2
These magazines should work in the M11-A1.

Referenced product: E29-40-SAS2B
The E29-40-SAS2B has been discontinued and the M11-A1 is only offered in 9mm. If you qualify for the Armed Professional Program, you could consider this: http://www.thesigapp.com/sig-sauer-we29-40-bss-lgcy.html. This...

Referenced product: MAG-229-9-10-E2
Response Date: Feb 7, 2019
The M11-A1 will accept MAG-229-9-10-E2 or MAG-229-9-15-E2.

Referenced product: SLIDE-229-9-B-RX
Response Date: Sep 12, 2019
This slide should work on the M11-A1.