AR Sponsor
Posted: 4/24/2003 7:35:50 PM EDT
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Ok, I know I am going to get flamed on this post by people telling me my rail acessories suck and this is why I am having problems fitting them on, but I have talked to several other people as well and we all have noticed this about the SIR rails (and ARMS rails in particular)- And the acessories in question which don't fit the sir rails DO fit onto knights rails, ar flattop rails, and other rail systems. 1. Accesories made to fit rails which must "slide onto" the rails to attatch do not seem to fit ARMS rails - however, items which clamps onto the rails from the top or side seem to have no problem though. The arms rails seem to be just a bit thicker which means normal slide on accesories need modifications to fit like filing or milling. I have tried this with over 5 different items. 2. Why is there a horizontal groove cut down the center of the ARMS rails - This means if you want to use an acessory which locks in place buy a screw up portion which locks between the rails instead of a using a full length bolt (ie some vertical grips), they simply wil not lock. Other rail systems and again flattops do not have this groove, and they are "mil-spec". I guess one of the things I am wondering is if the supposed "mil spec" standards designate the height/width/compositon of the rails systems? Also, why can all the "mil spec" rails have the threaded holes in different positions on the rails instead of being standardized? |
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1) Can you list what the [i]"5 different items"[/i] were that wouldn't slide onto the ARMS rails? 2) Have you contacted ARMS with your concerns? [i]I've had e-mail communication with them many times, and they've been prompt, courteous, and extremely helpful each and every time.[/i] I have #45/#51 SIR's, and a KAC RAS. Accessories/mounts that I have: ARMS #22M68 Aimpoint Mount - x2 ARMS #15 QD Reflex Mount - x2 KAC 1" Flashlight Mount - x2 KAC Vertical Grip - x2 (slide on) Surefire M900A (built-in ARMS QD Mount) - x1 [b]ALL[/b] of these items fit both the ARMS and KAC rail systems, along with a GG&G UFIR rail, with NO problems. [i]Additional accessories: Fobus/First Samco 1" Light Mount - x1 (slide on) This item did NOT fit on either rail systems, OR the GG&G UFIR rail, until I "modified" it with a file.[/i] Did you have a previous thread about some accessory/mount that wouldn't fit, and most of the replies addressed the quality of the accessory/mount itself? If that [i]was[/i] you .... I'm NOT attempting to flame you, but you might want to look at those accessories/mounts with the [b]established[/b] reputation for quality and fit. Your odds would be much better that they'd fit the first time around. I made one deviation from reputable products of ALL the items listed, and it was a BLATANTLY substandard product. I haven't made the same mistake twice, and as a result, I haven't had any more problems since. Chris |
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MRCR0603, please re-read the above post. I am not having any problems whatsoever with items that clamp onto the rail, like 4 of the 5 items you mentioned. I have way more mounts and combos than you have listed and have ever only had problems with ONE type, but it's consistent. The problem is only with metal/aluminum items that have been machined to slip directly onto the rail from the side where part of the item has a fixed "channel." And yes, the items were a vertical pistol grip, a rail adapter, 2 laser mounts, and a NV mount. Obviously, In the future I will just not buy this type of product beacause I'm tired of them not fitting. The rails may not even have a spec for items to slip on from side, since it is fairly unusual and most items do clamp in some means from the top, or side one side on, and then attatch the other, etc. But my question still is if the items that did not fit the arms rail did fit my knight's, how is that possible if both types rails have the same specs? And yes, I have contacted ARMS who said basically they don't believe any of their rails are out of spec. And to the most part I agree, except for the problem with this particular type of product. |
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Quoted: MRCR0603, please re-read the above post. I am not having any problems whatsoever with items that clamp onto the rail, like 4 of the 5 items you mentioned. [I]Again, I'm NOT flaming you, and I feel your frustration with your situation, BELIEVE ME![/I] [;)] I know what you're saying about the slide-on item(s) being the only ones that don't fit. The reason why I made the list, to include my three slide-on accessories, is to demonstrate that when you have that many items that properly SECURE to the two [b]different[/b] rail systems, slide-on or not, in MY mind, that rules out the rail systems as being the problem. I have way more mounts and combos than you have listed and have ever only had problems with ONE type, but it's consistent. The problem is [u]only with metal/aluminum items that have been machined to slip directly onto the rail[/u] from the side where part of the item has a fixed "channel." And yes, the items were a vertical pistol grip, a rail adapter, 2 laser mounts, and a NV mount. Obviously, In the future I will just not buy this type of product beacause I'm tired of them not fitting. The rails may not even have a spec for items to slip on from side, since it is fairly unusual and most items do clamp in some means from the top, or side one side on, and then attatch the other, etc. But my question still is if the items that did not fit the arms rail did fit my knight's, how is that possible if both types rails have the same specs? And yes, I have contacted ARMS who said basically they don't believe any of their rails are out of spec. And to the most part I agree, except for the problem with this particular type of product. If you would've posted in your original post the line that I underlined, I wouldn't have even responded since I don't have any [b]metal/alloy[/b] slide-on accessories. I'm sure that the specifications for the 1913 Picatinney railing is available somewhere on the 'Net so that you can measure your SIR rails on your own. Chris |
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