Where to and what type of AR-15 Riser mount to get?

[Dafapa]

I really need a riser mount for my AR-15 flat top. I'm not sure which one, where, and how much this should cost. Is it something I can go "econo" on, or does it require exactly tolerances so the scope can actually hold zero?

The gun in question is a 20" bull barrel DPMS. On my initial sight in excursion me and my buddy could hit golf balls at 50 yrds (I think it took us 3-4 bullets to hit 3 golf balls). I probably would have gone further, but the gun was short cycling, missfeeding, and jammy every round. One problem at a time though I guess.

[bzub12]

How much do you want to spend?

does your rifle have a conventional front sight tower?

Do you want a "quick release" one piece unit like from LaRue? they are about 200

YHM makes a "economy" 2 pce allen screw on picatinny riser and there are one piece thumb screw units available for about 35 bones that will hold a pretty good zero when you remove.

http://www.commandarms.com/product.asp?pID=170&cID=8
heres one that removes by thumb screws

[Dafapa]

Thanks. Mine has no front sight, something I came to regret after the fact. Its a scope or nothing on this gun. Unless I want to pay for a new gas block and buy a rear sight to boot. I'd like to spend as little as possible honestly, but if I buy it I intend to buy quality. I've already got a 900 for the gun, 200 for the scope, 100 for the bi-pod, and 60 for the rings. This thing should easily do sub moa (or better) based on what I've read. I really don't want to compromise my initial 1300.00 investment and ruin its accuracy potential trying to save a few bucks.

[abpt1]

dont get sucked into the way over priced shit ...

[Dafapa]

How much is too much? I just want a mount that won't be a weak point for my weapon.

[Dafapa]

My local fun store has a riser mount for about 68.00. Is that too much? and is likely to do the job better than the one above?

[ubersoldate]

How much do you want to spend?

does your rifle have a conventional front sight tower?

Do you want a "quick release" one piece unit like from LaRue? they are about 200

YHM makes a "economy" 2 pce allen screw on picatinny riser and there are one piece thumb screw units available for about 35 bones that will hold a pretty good zero when you remove.

http://www.commandarms.com/product.asp?pID=170&cID=8
heres one that removes by thumb screws


Another vote here for the YHM...Good cheap stuff...

[Dafapa]

Yeah I was actually liking the looks of them. I'd rather spend 35 instead of 68. I don't know if there is any disadvantage to the thumb screw set up, but I'd also feel better with YHM than the 18.00 ones I see around. Honestly I prefered the one I saw at the fun store today for 68.00, but aside from being a little more compact and a lot more expensive in implementation, I don't know that it will do the job any better.

[ubersoldate]

Yeah I was actually liking the looks of them. I'd rather spend 35 instead of 68. I don't know if there is any disadvantage to the thumb screw set up, but I'd also feel better with YHM than the 18.00 ones I see around. Honestly I prefered the one I saw at the fun store today for 68.00, but aside from being a little more compact and a lot more expensive in implementation, I don't know that it will do the job any better.
I like the hand screw ones, it can be taken off and another optic can be put on rather quickly..
But Im with ya on the price differences, I dont agree with the thought that just because it costs the most makes it that much better.

[Dafapa]

Is YHM a good company? Mostly I'm just worried if its a quality piece that won't cause my zero to drift. If its suspect I'd rather pay another 30 bucks and be sure.

[BL33D 4 M3]

I have this one. Won't break the bank and very nice and very solid:

http://www.wilsoncombat.com/r_lo_mount_scope_mount.asp
http://www.wilsoncombat.com/images/product/tr-mount.jpg

[ubersoldate]

Is YHM a good company? Mostly I'm just worried if its a quality piece that won't cause my zero to drift. If its suspect I'd rather pay another 30 bucks and be sure.
I think they are a great company..
Bleed, thats a great scope mount as well, I have a armalite version of that one, works excellent..

[Dafapa]

The above mount looks nice, but I already have leupold rings. I'm leaning towards the YHM job presently. I just hope 1/2" is enough. This scope is really low.

[BL33D 4 M3]

Heres one...

http://www.gunsnet.net/forums/showthread.php?t=351221

[ubersoldate]

Heres one...

http://www.gunsnet.net/forums/showthread.php?t=351221


Damn!
Dafapa thats a good deal for 15 bones, Id jump on that...If not I might... :yeah:

Good lookin out Bleed!

[Dafapa]

Thanks for the heads up. Go for it Uber. I'm still debating and counting my pennies.

[ubersoldate]

Thanks for the heads up. Go for it Uber. I'm still debating and counting my pennies.


What direction are you looking at? Just out of curiosity....

I have a larue QD LT-101 and that is one awesome mount, raises the scope perfect, but its pretty exspensive...
I got it for a gun that is a accuracy AR, so I really wanted the ability to take it off for cleaning and put it back on without loosing zero..

This yhm is pretty slick as well..I have the YHM-227A and its a nice unit..

I guess one would have to ask do you need the mount to be able to remove alot? What size rings are you using?

Just wondering, being a AR guy myself, so Ive tinkered with a ton of accessories and love to learn more!

[Dafapa]

What direction are you looking at? Just out of curiosity....

I have a larue QD LT-101 and that is one awesome mount, raises the scope perfect, but its pretty exspensive...
I got it for a gun that is a accuracy AR, so I really wanted the ability to take it off for cleaning and put it back on without loosing zero..

This yhm is pretty slick as well..I have the YHM-227A and its a nice unit..

I guess one would have to ask do you need the mount to be able to remove alot? What size rings are you using?

Just wondering, being a AR guy myself, so Ive tinkered with a ton of accessories and love to learn more!


I'm thinking either the YHM one, or the one I saw in my local fun shop (it says brownell's on the package but couldn't find it online). The brownells one locks into place with vertical screws, so nothing sticks out from the sides. However, I think the YHM may be of good enough quality not to bugger things up.

Currently I've got a DPMS with a 20" bull barrel, 1:9 twist, free float handguard with a flat top. I'm hoping to get some 68 grn projectiles soon (I was recommended that as being about optimal bullet weight for 1:9 twist). The scope is a Bushnell elite 10 (Barret ships it as an econo option on their rifles at the time I was researching scopes). It was only a bit over 200, but it had a lot of good reviews. I think the secret to its quality is that it's a fixed power scope, which I can live with. My curent rings are quick detach leupolds (I forget the size at the moment, I think its 1").

Currently I don't remove the scope when cleaning (I just assumed it would mess up the zero). Do you think it would actually be possible with something like the YHM mount to pop it on and off and keep my zero?

[ubersoldate]

Currently I don't remove the scope when cleaning (I just assumed it would mess up the zero). Do you think it would actually be possible with something like the YHM mount to pop it on and off and keep my zero?

Thats a tough one, hard to say.
For me, Ive had good luck and would be able to retain zero or very close as long as I made sure to keep it in the same place on the rail.

The brownells one might be a chinese knock off or does it say US made?

I think the biggest issue is the screws stripping when it comes to height rails as aside from running ovet them I dont know what else could go wrong with them...

keep us posted!

[Dafapa]

Thats a tough one, hard to say.
For me, Ive had good luck and would be able to retain zero or very close as long as I made sure to keep it in the same place on the rail.

The brownells one might be a chinese knock off or does it say US made?

I think the biggest issue is the screws stripping when it comes to height rails as aside from running ovet them I dont know what else could go wrong with them...

keep us posted!

Now that you bring that up, I'm leaning more towards YHM. Before I get the riser mount though I want to get my ARs inability to cycle fully figured out. I've tried cleaning, lubing, hand cycled it 1000 times, and I'm currently storing it with the bolt locked back. Next time I make it to the range I'm planning to hand load some fairly hot ammo and hope that fixes the short cycling problem. I find having to stop to clear a jam every shot seems to hinder my marksmanship...

[ubersoldate]

Now that you bring that up, I'm leaning more towards YHM. Before I get the riser mount though I want to get my ARs inability to cycle fully figured out. I've tried cleaning, lubing, hand cycled it 1000 times, and I'm currently storing it with the bolt locked back. Next time I make it to the range I'm planning to hand load some fairly hot ammo and hope that fixes the short cycling problem. I find having to stop to clear a jam every shot seems to hinder my marksmanship...


So what is it doing ?
Firing a round and not ejecting? What DPMS barrel is it? I had to take a cleaning rod on a drill to really clean out mine, it was sticking pretty bad..

Have you tried the "O" ring extracter helper yet? That will help as well...

What ammo?

Guess there are a million questions to figure it out...

[Dafapa]

I don't know how to ID the barrel (except 20" bull barrel, 1:9 twist) do they have other designations (maybe lot serial number or something)?

I don't think I've had an extraction failure (one time a case didn't get fully ejected though, it was stuck outside the chamber and in front of the bolt. Normally the incoming round just get jammed with the bolt kind of hitting it from the side. The manner of jamming indicates to me that the bolt didn't go back all the way and caught the round on the side (as opposed to the rear) when moving back forward. The rifle also doesn't lock back hardly ever. A few trips ago me and my buddy stripped and lubed it 3x and then it worked ok with some high end hunting rounds he had.

Last range trip I was using winchester white box 55 grain stuff. I've also got some S&B but I didn't take it last time. I've got one box of black hills 68 or 69 grn ammo, but I don't want to blast it just for trouble shooting (it was seriously expensive). Indications at this time are the ammo is loaded too light, and the gun probably needs some more breaking in (should have less than 200rnds through it). If the heavier loads I plan to try next time don't do the trick then I'm out of ideas though.

[BL33D 4 M3]

hhhmmm, what type of stock, buffer and spring are you running?

[Dafapa]

Its a fixed stock...as to buffer and spring...whatever DPMS shipped with it. Sorry I don't know more. Is there a way to look at them and tell?

[bzub12]

If you have a A2 stock it probably has a standard rifle buffer and spring....interesting thing i have observed about a friends new DPMS M4 is that his bolt also fails to lock back consistently on a empty mag and the buffer spring tension on his rifle seems noticeably stronger than on any of my M4's.

[Dafapa]

Hm...me thinks I've bought my last DPMS...what would a new spring run me?

[ubersoldate]

Hm...me thinks I've bought my last DPMS...what would a new spring run me?

I dont know man, I would suggest checking into the buffer spring but I would also say to run the thing and really break it in..
I didnt like my DPMS either untill it broke in, now it runs really well..
I was having extraction problems and stuck casings..
Dont rule out the brand just yet!

My DPMS...
http://www.gunsnet.net/album/data//500/medium/141_4104.JPG

[bzub12]

Hm...me thinks I've bought my last DPMS...what would a new spring run me?


My diagnosis of your rifles problem is purely anecdotal...... it is sometimes hard to isolate the problem on misbehaving AR's...over the Internet almost impossible lol.


the buffer springs are not expensive and probably a good idea to have as a spare though.

[Dafapa]

So are there weaker springs/buffers I could get? If its not too much I might just try that.

[bzub12]

Take the buffer and spring out and measure the springs length, i will measure one of mine tonight and if the lengths are the same or close enough that it would not make a difference ..then it is likely your problem lies elsewhere.


if you dont know how to remove the buffer and spring all you do is separate the upper from the lower and cock the hammer on the lower push the spring loaded plunger down that holds the buffer in and pull it out with the spring.

[Dafapa]

I went with the yanky hill riser mount. I found someone selling them at a gunshow, and figured at their price it'd be cheaper than paying for shipping most likely, so I got it for a bit under 40.00. Looks like a decent unit.


As to my rifle's inability to cycle...I took it out yseterday after storing it with the bolt locked back for some time, and I also brought some reloads of varying power. It didn't short cycle on the factory winchester I had, and it even locked back once. It worked perfectly with the 21 rnds of assorted reloads I fed it. Never short cycled, and locked back every time. I'm thinking it was a combination of a stiff spring, and likely weak factory ammo (it was very much econo winchester ammo).

We were at an indoor 25 yrd range, so I really didn't have the facilities to sight it in. Next week I'm planning to go back to a 100yrd outdoor range with good benches and finally sight it in. I think I may sight it in for 69 grn reloads.