Question for the AR Experts :)

[CallmeGray]

Hello,
first, i'm kinda new to this forum so bear with me

I just finish building my first and only AR, this is my hunting/plinking/sd/shtf/and everything else rifle. i wanted a easy to carry, somewhat lightweight, with a X10 scope for long range shooting at man-size targets (0-500, 700 max yards) and this is what i build.

specs:
Spike tactical lower
CMMG M4 Upper 1/7
CMMG kit.
Bushnell AR Optics Rifle Scopes 223 BDC
HBR Harris Bipod 6" to 9"

now, my question is: what did i build? lol is it an M4, SPR or DMR... maybe something else? what is the correct definition other than just AR?

 

[Telekinesis]

You built a gun that works for you. It's not a M4 because it isn't select fire (hopefully) and it doesn't have a 14.5" barrel, and it isn't a SPR or DMR because it's not set up for long range accuracy (shorter barrel, fixed front sight and no floated handguard). That's the whole beauty of building your own weapon, you get to choose the exact parts you want/need for your specific situation (though I think 700 yards is a bit optimistic).

 

[OneWound]

How does it balance with bipod on the front?

 

[holdencm9]

They call that an M4gery. Also known as AR carbine.

I don't think the presence of a scope and bipod automatically make it an SPR, and barrel too short, although it is all just semantics man.

DMR I think usually is a .308, but same general purpose.

 

[nastynatesfish]

I'm thinking you need taller rings on the scope but the rest looks good. Maybe add a set of BUS to the mix for just in case

 

[C-grunt]

Load that up with some M262 and it will get out to 700 yards no problem. Technically a SPR has a 18 inch barrel. The 16 inch barrel is more inline with a Recce rifle. There are so many variants of the DMR as its more of a general idea than a specific weapon.

 

[chicharrones]

now, my question is: what did i build? lol is it an M4, SPR or DMR... maybe something else? what is the correct definition other than just AR?

It's the now traditional American Carbine.

Speaking of SPR, my M15 got released from ArmaLite with a lower marked SPR Mod 1. I guess they ran out of M15 marked lowers.

 

[yzguy87]

CallmeGray, can you see the front sight through your scope?

Accuracy testing will be fun! If you can afford it, get several types of ammo and try them out.

 

[CallmeGray]

How does it balance with bipod on the front?

It balance great with the scope, and a little front heavy with the standard iron sights.

They call that an M4gery. Also known as AR carbine.

I don't think the presence of a scope and bipod automatically make it an SPR, and barrel too short, although it is all just semantics man.

DMR I think usually is a .308, but same general purpose.

yeah i think M4gary sound about right since it's a m4 kit with a scope.

I'm thinking you need taller rings on the scope but the rest looks good. Maybe add a set of BUS to the mix for just in case

i try them, and this setup it's perfect for me, as for BUS, i try them but i have to move the scope way forward.

 

[gotigers]

M4gery/carbine with scope and bipod.

Nothing wrong with it. It looks like a good all around shooter.

edit: it does need taller rings.

 

[ms6852]

"now, my question is: what did i build? lol is it an M4, SPR or DMR... maybe something else? what is the correct definition other than just AR?"

FRANKENSTEIN?? it has all kinds of different parts, but good quality. Nice build.

 

[MistWolf]

You'll find the will work much better if you shave down the front sight. In it's current configuration, the center of the reticle is blocked which will make it difficult, if not downright impossible, to get a precise sight picture. The front sight will usually blur out when looking through the scope, but you can't get around the fact the reticle is blocked

 

[ID-shooting]

M4gery-A3? LOL. really though, I like the "American Carbine" moniker.

 

[CallmeGray]

M4gery/carbine with scope and bipod.

Nothing wrong with it. It looks like a good all around shooter.

edit: it does need taller rings.

well i really have a good view with those rings

Here's the scope view at 3x at about 130 yards

and this is at 12X

 

[allaroundhunter]

Can you go prone with that bipod and a 30 round magazine?

 

[JustinJ]

well i really have a good view with those rings

He's referring to how low your scope sits relative to cheek weld, not view obstruction by the front sight. Essentially, ideal scope height would be so that the center of the reticle is around even with the front sight post so that your head is in a more natural and ideal position. I would suggest you try it with higher rings or even a single piece rail riser mounted between your rings and the top rail of the gun.

 

[Bartholomew Roberts]

The guys saying taller rings are either really bothered by the tiny scope shadow at the bottom from the front sight base at low magnification or they don't understand focal length. You can use a 3x ACOG with a fixed front sight base and you'll have to look to see it on the scope. At higher magnification, you'll notice it even less.

All taller rings are going to do is increase your height over bore. Unless you need to get the scope over an IR laser, I'd leave the rings as is.

However, if you want to shoot to 700yds, I'd suggest free floating the barrel. Otherwise you are going to see variance due to the change in barrel harmonics. At less than 300, it won't make much of a practical difference usually (assuming you don't rest the barrel directly on a barricade or something); but you'll notice it at 500 out.

 

[JustinJ]

All taller rings are going to do is increase your height over bore. Unless you need to get tge scope over an IR laser, I'd leave the rings as is.

If he can shoot it comfortably I suppose it's fine but I believe for most an optic that low would not be ideal as too much head cant would be required, for lack of a better term. If the height were ideal wouldn't the AR have lower standard iron sights to begin with? All AR specific optic/mounts combos that I'm aware have a height above bore equal to that of iron sights.

 

[Bartholomew Roberts]

I think you are confusing the top of the dogears on the front sight base for being the height of the iron sights. The actual front sight post is lower than the top of the dogears which means he is at most maybe 0.2" off the standard height over bore for an AR (just eyeballing it).

Of course, as always, you need to go shoot it. If it works for you it works.

 

[Walkalong]

I choose a scope/red dot height so it lines up with my eyes line of sight when shouldered for that application. For me that is co-witness or 1/3 co-witness, so it works fine with zero magnification. You'll never see the front post with magnification.

For fast work I like a higher sight (More heads up both eyes open cheek weld on the stock), and for target shooting I like it a little lower.

Set the optic for what is comfortable to shoot, and don't worry abput the front post with a scope.

 

[Fishbed77]

I don't think the presence of a scope and bipod automatically make it an SPR

They don't. An SPR has a pretty specific feature set, at the core of which is an 18" barrel with a rifle-length gas system and an SPR profile.

Of course, like all other terms, it has become pretty genericized as of late.

 

[JustinJ]

I think you are confusing the top of the dogears on the front sight base for being the height of the iron sights. The actual front sight post is lower than the top of the dogears which means he is at most maybe 0.2" off the standard height over bore for an AR (just eyeballing it).

On AR's I've owned with A2 front sights, the front sight post is generally just a tad bit lower than the dog ears although it can of course be adjusted up and down. It appears to me as though the top of the objective lens is at the same height above bore as where the the top of the front sight post would be so the reticle center would be well low of standard AR optics and iron sights height.

While I agree that he should mount the scope at the height which best suits his anatomy the vast majority of AR mounts would place it significantly higher as such is ideal for most people. My suggestion is to simply try it at standard AR sight height if possible.