Need to ask for some help please as I recently started shooting a AR-15 style rifle chambered in 9mm for local Steel Challenge matches. The rifle has a flat top on the receiver, in that it does not contain a handle on top of the receiver.

My issue is that when I cheek the stock (standard MagPul CTR Mil-Spec stock) I find I can only place the lower 1/3 to 1/2 of the stock butt plate on my shoulder to get good eye/red dot/target alignment, which means that the top half of the stock butt pad is in the air not making contact with my shoulder.

Being that the red dot sight is a rail mount C-More sight, which is a mount that is mounts and sits very close to the receiver’s Picatinny rail, if I put this red dot on a small riser, would this allow the stock’s butt plate’s position on my shoulder to come down (entire butt plate making contact with my shoulder) thus allowing better eye/red dot/target alignment?

My goal is to NOT lean my head over at an angle to get the proper sight/target alignment with my eye. Thanks for your feedback.

A low mount like you're describing is fine for a drop comb stock, like a traditional rifle or shotgun.

But because the stock on an AR is straight in line with the receiver and barrel, red dots installed on ARs utilize raised mounts to bring their eyeline 1.5"-2" above the top of the upper receiver rail.

Sounds like you need to invest in either a different mount or a riser, or perhaps a different optic altogether if you can't locate an AR-specific mount/riser for that C-More sight.

Rogue - Thanks Sir for your feedback. I will follow your recommendation and start with a riser and if it that does not bring the red dot alignment up enough, I will look at a different red dot. I prefer to start with the riser pathway as it may be more affordable for me, and right now that is important. THANKS again for your quick reply and recommendations. Greatly appreciate your help. Mark

Rogue - Gonna order one of these and give it a try. They come in 1/2”, 3/4”, and 1” heights. Gonna try the 1” height to see if it provides me the corrected height I need. Thanks again for your help.

https://www.leapers.com/products-utg-mt-rsx1l.html

IIRC my ACOG sight puts the dot at 1.5 inches above the bore center.

quote:

Originally posted by sjtill:
IIRC my ACOG sight puts the dot at 1.5 inches above the bore center.

~1.4" above the rail is the typical absolute cowitness mount height, which puts the center of the optic in line with the standard front and rear sight height on an AR.

~1.6" above the rail is the typical lower 1/3 cowitness mount height, which puts the center of the optic slightly above the standard front and rear sight height.

Most optic mounts intended for use on an AR will fall within those two ranges (roughly between 1.4"-1.7" from the top rail to the optic centerline.)

But nowadays some folks are starting to go with ~1.9" or even ~2.2" height mounts, which puts the optic centerline well above the standard AR sight height. These extra tall mounts are in vogue with the Guntube crowd currently, as touted by a number of the popular former special ops Youtube guys. I'm generally not a fan of these overly tall mounts and their resulting "chin weld", but I concede that this does have a few potential benefits in CQB/room-clearing situations to allow for a more heads-up shooting stance and possibly getting faster hits when rapidly coming up from low ready, plus this taller height also allows for easier use of the rifle while wearing NODs or gas masks. But outside of niche groups like dedicated special operations or SWAT teams, I'm not convinced that it's needed or even all that useful for most rifle owners. For the average user, I think it's a solution in search of a problem, and outside of those special teams is mostly just an opportunity to sell new optic mounts to folks who want to throw money at keeping up with the latest high-speed cool guy trends.