Drill and tap magwell ar15

[BreechFace]

What about a cantilevered M-Lok rail section that attaches to the M-Lok in front of your handguard mount and cantilevers back over the handguard mount towards the mag well to attache a grip. See links below.

https://www.amazon.com/CDM-GEAR-M-L...ds=mlok+cantilever+rail&qid=1676477967&sr=8-8

https://www.amazon.com/GG-GGG-2214-...s=mlok+cantilever+rail&qid=1676477967&sr=8-16

Just a suggestion how I mount my AR's is using a stubby vertical grip 2/3's down the rail towards the front (this location would change for a person's arm length) and us a c-grip with my thumb over top the rail and the pad of my hand between the base of pinky finger and wrist pulls against the vertical grip. So I don't grip the vertical grip with my fingers like a bat but use it as a stop against my hand to pull the rifle into my shoulder.

 

[zdc1775]

Might be too angled for you in the middle position but I would start here.

https://monstrumtactical.com/5-position-folding-vertical-picatinny-foregrip/

Or for a bit more you could get one of these.

https://www.wingtactical.com/firear...halo-minivert-grip-fit-both-keymod-and-m-lok/

 

[gotboostvr]

Might be too angled for you in the middle position but I would start here.

https://monstrumtactical.com/5-position-folding-vertical-picatinny-foregrip/

I think there's some other variants of that grip with more granular adjustments. Might be a good place to start.

 

[zdc1775]

I think there's some other variants of that grip with more granular adjustments. Might be a good place to start.

Very possible, that was just from a couple minutes of googling.

 

[wesmonster]

I run a few Fab Defense magwell grips, they work great for me. It can be tight using a 10 round mag but when shooting off a tabletop I like the FabDef grip in conjunction with a bipod.
And I think trying to tap a magwell is just gonna ruin a lower.

 

[MachIVshooter]

Just remember the basic physics of the leverage created by the geometry.

Magwell grip or VFG very close to magwell=less shooter movement per degree of trajectory vector change. That's good for rapid transitioning but bad for stability/accuracy.

I never liked a close-in offhand grip, especially with rifles having 16" or longer barrels, move around too much. Adding suppressors only makes matters worse by adding length and putting a not insignificant mass at the end of your "lever". But I have long arms and shoot with a bladed stance.

I don't try to grab the very end of a 15" handguard like Costa, either, though. Somewhere in between.