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Posted: 10/14/2013 10:07:22 AM EDT
| I already tried Samson in the Industry forum with no response for several days so I figured I'd ask here. I just got an Evo rail and I mocked it up last week. It appears that the top rail on the Evo is higher than the upper. Is this how it was designed or do I have an abnormality? No pics or exact measurement but I can get them if necessary. Anyone else with an Evo fore end see this? Thanks |
Checked the bushings last night and I did have them the right way when I mocked it up. Tried them backwards and got the same results. Here is a picture of the difference with the bushings on the way the instructions say they should go. I noticed that the body lines line up fine but the rail section is off on one or the other. It's a Rock River 9mm upper receiver, maybe that is not machined right?
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The height difference is only 2mm.
I wonder if the OP got a set of barrel bushings that were just slightly bent, out of round, or too much material. It looks like a slight bit of Dremeling on the top of the bushing, just removing a 1mm of material would allow the rail to lay flush with the upper. |
| Photos are only lightly tightened. I tried going tighter and it helped a hair but still a very obvious difference. Thanks for all the help, I'll be sending it back to where I got it for a refund and look into another rail. Anybody know anything about the Seekins Precision MCSR V2 Key Mod Rail System? |
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Photos are only lightly tightened. I tried going tighter and it helped a hair but still a very obvious difference. Thanks for all the help, I'll be sending it back to where I got it for a refund and look into another rail. Anybody know anything about the Seekins Precision MCSR V2 Key Mod Rail System? Since you originally headed down the Samson Evo path, have you looked at the Rainier Evo Rail. 
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Yes the Rainier Evo was the one I wanted but they are out of stock and can't tell me when they will be back in stock. So I compromised for time consideration and chose the Samson version of the Evo.
I'd rather not alter it to the point that if it still doesn't work I can't return it or sell it easily. The barrel looks straight to me when the rail is off. Is there another way to put a barrel in an AR other than lining the pin up? I am far from an expert on assembly but this isn't my first build, but this is my first 9mm build. It probably looks canted because the rail is not on very tight in the photo. Screwed down tight the slight cant goes away but the rail mismatch stays basically the same. I called today and talked to the people at Samson and they did offer to have it shipped in to be checked for specs. They felt it wasn't an out of spec rail though and more likely an out of spec upper (uppers made during the panic as it was a recent purchase) so I declined to waste their time and money on shipping. So like I said I'll probably be returning it an waiting for either the Rainier or looking at the Seekins Precision MCSR V2 Key Mod Rail System. Bummed cause I like this rail. Any other slim rail an Octane 9 will fit under? Thank you all for the suggestions and rubbing it my face that your Samson rails fit flush 
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Just wanted to give an update, looked into some of the new suggestions last night and ... pjomalley had the fix. I didn't take the tabs off just filed a little off the backside and now it fits like it should. Thanks again for all your help. Good to hear man, glad you got the rail to work, the Evo rail is great. I love mine |
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Good deal. I thought some filing would be necessary. For clarity, you wound up filing a bit off the rail or the upper? I took a small amount off the back of the anti-rotation tabs on the rail. Can't see that it was modified at all with it all together. |
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Since you originally headed down the Samson Evo path, have you looked at the Rainier Evo Rail. https://www.rainierarms.com/img/shop/product/11112dcb1a575209a02895dd1ef7de86.jpg http://31.media.tumblr.com/5b6ef61a8669ac98e84c3e19f18199cc/tumblr_mso554bhLc1rw5vcwo1_1280.jpg Quoted:
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Photos are only lightly tightened. I tried going tighter and it helped a hair but still a very obvious difference. Thanks for all the help, I'll be sending it back to where I got it for a refund and look into another rail. Anybody know anything about the Seekins Precision MCSR V2 Key Mod Rail System? Since you originally headed down the Samson Evo path, have you looked at the Rainier Evo Rail. https://www.rainierarms.com/img/shop/product/11112dcb1a575209a02895dd1ef7de86.jpg http://31.media.tumblr.com/5b6ef61a8669ac98e84c3e19f18199cc/tumblr_mso554bhLc1rw5vcwo1_1280.jpg That my friend, is one good lookin weapon. What grip and hand stop are you running? I'm assembling an 11.5" SBR with a RA Evo And keep looking for the last couple parts to bring it all together. Thanks. |
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