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A.R.M.S. #18 Mount Questions.

6K views 17 replies 17 participants last post by  SignalGuy 
#1 ·
I am wondering if anyone has a bead on a good price for one of these mounts and if there is a preference between the full rail version and the earlier half rail version. I am building a scout rifle and want to use one of these mounts since I have heard good things about them and they sit low on the receiver. I plan on using quick detach scope mounts so I may use a couple of different scopes such as a PVS 4 and some type of 3x9 type scope,probably Leupold. Any info would be helpful.
 
#2 ·
Arms 18

I don't know who might have the best prices, but there is a major difference between the old style and new ARMS 18 mount. The older split rail model is much less likely to cause stove pipe jams because it's open design allows the brass better clearance for ejection. The ARMS mount rail sits lower than most other mounts and is prone to these types of failures. Other Brookfield style mounts like Sadlak and Smith have fewer problems. You can still mount the scope as low as the bells will allow with these other mounts and they still allow the use of iron sights with the mounts installed.
 
#4 ·
I have a newer mount.. "full" mount.. never a "stove pipe" never any ejections problems... if you have a proper ejector all's well. The M14 ejects to the side not up.

so... buy an ARMS 18 and you should not have an issue.. bought mine from Fulton.

I've seen so many "rumors" about certain accessories that have been unfounded for 99% of the applications that I don't pay much attention.. If the ARMs 18 had an issue I would say that ARMS would have addressed it..
 
#5 ·
Well sorry to burst your bubble, but I am one of the few that had problems with the ARMS mount. I think it is a great mount but it sits so low it kinda invites a jam. Mine would catch the brass between the top of the oprod handle and wherever my scope rings were. I tried moving the rings forward rearward, didn't make a difference. The rings were Arms QD. I swapped to a steel Sadlak and never had one hiccup. I also prefered the extra length the sadlak offered along with the more positive mounting design. I still like the Arms mount and it is built out of good materials, the company's CS was top knotch, just too bad the mount didn't work well on my rifle.
 
#6 ·
The ARMS 18 is an excellent mount. Unlike some others, it actually looks like it is a part of the receiver, and not just an ugly chunk of something bolted to it.

IMO though, the original open above the bolt model, is the best mount ever designed for the M14.

The old GG&G mount was another such type open above the bolt, and had a pleasing appearance similar to the ARMS mount. I sure wish that I could get my hands on one of those.

They are rarer than hen's teeth.GI2
 
#7 ·
I'm also a fan of the "old school" ARMS mount as it just makes sense to me to have a larger ejection port. You do have to be willing to put up with an occasional brass nick on the bottom of your scope without the 'full' rail protecting it.


 
#8 ·
grooves

ok so I notice what look like grooves on either side of the mount,like ruger scope mount grooves almost. What are they for? Also does anyone know why they changed the design? Was it the ejection issue hitting scopes? I like the open top version better for ejection issues and looks but I can also see how the full rail coud be useful. Just really interested in the grooves or mayve cutouts under the rail.
 
#17 ·
ok so I notice what look like grooves on either side of the mount,like ruger scope mount grooves almost. What are they for?
The grooves are so you can loosen or tighten the nut on the scope ring, which on a lot are a 1/2" socket.

Also I had an arms mount, I really liked the fit and finish, I mounted it on my SAI loaded and as mentioned previously, the SAI rx does not have the same dimension of a usgi rx and I could not zero my scope because it was not in line with my bore.

Sold it, if I had a Fulton or LRB and wanted a mount I would try it.

Ps. While trying to zero my scope I did not have any stove pipe jams or any malfunctions that I recall.
 
#9 ·
Wouldn't the grooves be for a socket or wrench for certian rings?

Anyway, I bought a used promag copy on the cheap because I read so much about the jams, after 500 rounds or so and no jams, I will be getting the ARMS soon. The promag also holds a good zero for me and hasn't shot loose, so the Arms has got to be even more solid with the fore and aft mounting differences between the copy, and the real thing.

Hopeful anyway.
 
#10 ·
I've got 2 cents to add here since I just put an arms 18 on my receiver and I've had some troubles. I find the rail a bit too short for my needs.
The ocular bell of the scope(Leupold 3.5-10x40) won't clear the hood on the NM aperture sight and the limited length of the rail won't provide sufficient rearward placement. Higher rings make the scope sit too high to be comfortable.

I also tried the IOR M1 that I planned on using but again, I have no forward/rearward room even with the rings butted against the adjuster knobs; it straddles the full length of the rail and I can't adjust for eye relief.

My solution was a 3/8 riser block that is about 1.75" longer than the arms mount. Just enough height and length to use the scopes I have without the purchase of new (expensive) sets of QD rings.

Lastly, I have another mount I am very pleased with that is a split rail like the older arms 18's. It's made by TSA and sits a bit higher but I like it a lot and it's reasonably priced. Ditch the rings ...they're not good quality and cheap arms knock-offs.

http://www.pacificcanvasandleather.com/hardware/pcl_122.htm
 
#11 ·
Got my ARMS 18 mount(full rail)on ebay. Paid just a little over $100. No problems with mounting except that I did replace the front set scew with a headless one to clear the handguard. Also went ahead and replaced the main mounting screw with one from Sadlak. (Wider area under the head against the mount) I carefully filed the end down so it would not touch the bolt. No ejection problems of any kind with 40rds of Lithuanian ammo or 20rds of 173 and 168 hpbt loads. I had painted a small white line on the bolt and mount before hand and no movement. I had to use rings with .535 height (High) for the Pentax scope to clear the rear NM peep sight that was bottomed out.
 
#15 ·
I cant believe i haven't heard of my experience. I put an full rail arms 18 on my loaded. It fit and went on perfect or so i thought. when i put a scope on it i realized that it did not fit square to the receiver. As I understand it it is not arms fault but Springfield's as not all of there receivers are perfect. I could have sent my rifle back to let them look at it and I have no doubt that it would have fit when I got back. But i did not want to part with her so i bought a sadlak and works great.

BTW no ejection problems with the arms on my rifle but mine is broken in and throws the brass to the side now. when she was new it was almost a 12 o clock ejection.
 
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