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It was mainly for the 922 compliance since the parts count has been left up to interpretation. So having more than necessary is better than right at the line. I hand filed the fitment so they seat well. Nothing can be done about that weird offset between the halves though.

I like it because it’s simple, light, rugged, runs on both battery and solar, plus it has a quick release if all that fails and need to go to irons. I raised my cheek riser to match it. I prefer the more relaxed head up position. That’s why I didn’t try to get anything that actually cowitnessed.

Another option is you can remove your iron sights. They tend to clutter your sight picture thru an optic. You’ll remove 3.5 ounces from the M4 and have faster target acquisition since you won’t be occluding the optic’s red dot.

I use the padded BlueForceGear QD slings with sewn in connectors. Connecting to the opposite side provides a lot of benefits. It helps control how much the shotgun can roll away from your body when you’re hands off. When slung down the front of your chest, and you’re hands off, there is a lot less rotation of the shotgun since the shotgun is being held against your chest vs. the sling having a 9 pound shotgun attached to the shotgun and which wants to pivot where it connects. Connecting to the outside prevents the sling from bunching up between your chest and the stock which can prevent you from shouldering the stock in the pocket.

I'm a fan of the padded version of the Magpul MS1 and run them on both of my SG's. I bought a BFG sling and did not like it. I found it to be a very stiff and abrasive material to the skin. As far as pinning it to the opposite side of the buttstock, it's very simple. If you run the rear on the same side as the front in 2 point mode slung across your body, the buttstock will roll away from your chest instead of holding it close and flat against your body.