Yes, the SBPDW has a QD sling mount on the end of the mounting bracket of the PDW. You can single point carry a firearm using this sling and that QD point or you can attach another QD point farther down the firearm to carry it in a more traditional two point set up.
You would need this adapter for the rear of the stock: https://www.opticsplanet.com/magpul-industries-sga-stk-sling-mount-kit-type1.html and this adapter for the front of the stock: https://www.opticsplanet.com/magpul-industries-mlok-sling-attachment.html
The Magpul MS4 Dual QD GEN 2 Multi-Mission Sling should work fine with that brace.
The Magpul MS4 Dual QD GEN 2 Multi-Mission Sling can be mounted to a Mossberg 590A1. However, the mounts you need will depend on what model of 590A1. If you have the Magpul edition then there is already an MLOK QD mount on the magazine tube. Please email us at techsales@opticsplanet.com so we can get more information in regard to how you want to mount the sling.
This Magpul MS4 Dual QD GEN 2 Multi-Mission Sling features factory installed Magpul QDs that would be compatible with your SBA3 brace. We do carry the MS4 QDM version that can be found by using the link below:
https://www.opticsplanet.com/magpul-industries-ms4-qdm-sling.html
The Magpul MS4 Dual QD GEN 2 Multi-Mission Sling mounts to QD attachment points. So it will work with the DDM4V11 with the QD attachment points on the handguard and stock.
The Magpul Zhukov Folding Stock has a QD sling attachment point in the rear of the stock. So the Magpul MS4 Dual QD GEN 2 Multi-Mission Sling will mount to that stock.
The Magpul MS4 Dual QD GEN 2 Multi-Mission Sling mounts using QD mounts. In order for this Magpul MS4 Dual QD GEN 2 Multi-Mission Sling to mount to a Colt A2 M16, you will need to find a way to mount a QD mount to the rifle. This could be done by replacing your stock with a stock that has an integrated QD mount or even using something like the Strike Industries QD Mount Castle Nut. Here is a Sling that will mount to your rifle with no modification.
https://www.opticsplanet.com/magpul-industries-ar-rifle-ms1-sling.html
If your gun has a QD mount then will need no extra parts to mount the Magpul MS4 Dual QD GEN 2 Multi-Mission Sling.
This Magpul MS4 Dual QD GEN 2 Multi-Mission Sling uses a QD mount to attach so it will attach if your rifle has a QD Mount either on the stock or handguard.