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Posted: 9/14/2010 7:14:40 PM EDT
I just got my BCM A4 Upper in the mail, and promptly put my KAC RIS on it.

The lower part of the RIS rattles...I know it's not a FF rail, but shouldn't this thing be pretty solid?

Hax

Link Posted: 9/14/2010 7:28:15 PM EDT
Link Posted: 9/15/2010 5:02:07 AM EDT
It is normal for the lower rail to have play in it.
Link Posted: 9/15/2010 5:14:14 AM EDT

Originally Posted By Lancelot:
Make sure it is properly seated, and that the delta ring is pushed forward all the way.

This. Mine fits very snug. Make sure you tighten down that front clamp on the top rail and then get the bottom rail all the way up inside the top rail. Push "forward" on the delta ring after they're both in there and get it to clamp down properly on both halves. I really like this rail even though its technically "dated." Fits my BCM SOCOM upper perfectly.
Link Posted: 9/15/2010 5:40:18 AM EDT
Out of curisosity.... did your rail come with the steel triangle shaped insert that goes between the two halves into the handguard cap? I ask this because a firend of mine got an RIS that did not have this piece and his was very sloppy as well. Mine is rock solid on the bottom and I do have the insert. There are two springs on the insert that put pressure on the lower section.
Link Posted: 9/15/2010 6:09:46 AM EDT

Originally Posted By HatriXx:
Out of curisosity.... did your rail come with the steel triangle shaped insert that goes between the two halves into the handguard cap? I ask this because a firend of mine got an RIS that did not have this piece and his was very sloppy as well. Mine is rock solid on the bottom and I do have the insert. There are two springs on the insert that put pressure on the lower section.

Are you talking about the RAS? The RIS and RAS are different rail systems. My RIS did not come with a triangle insert.
Link Posted: 9/15/2010 6:17:22 AM EDT
Originally Posted By HatriXx:
Out of curisosity.... did your rail come with the steel triangle shaped insert that goes between the two halves into the handguard cap? I ask this because a firend of mine got an RIS that did not have this piece and his was very sloppy as well. Mine is rock solid on the bottom and I do have the insert. There are two springs on the insert that put pressure on the lower section.


That insert is for the Rifle M5 RAS and for mounting a M203. Unnecessary if you are not mounting a M203.
Link Posted: 9/15/2010 10:44:27 AM EDT
Thanks for the replies guys.

I took off and put on the RIS about 10 times last night, every time, the damn bottom half would rattle.

This morning, I got up, and took the RIS off AGAIN, and just studied them. On the TOP portion of the RIS, there's a small 'bolt' with an allen head in it that holds what looks like a small bracket that the Delta ring attaches to, the bracket goes around the gas tube...this little piece was loose. I put some loc-tite on the bolt, snugged it down about a 1/4 turn past 'snug', and then re-installed...the RIS is as solid as a rock now.

As for the 'bracket', I don't have that part.

Hax
Link Posted: 9/15/2010 10:49:05 AM EDT
Originally Posted By SirHacksalot:
Thanks for the replies guys.

I took off and put on the RIS about 10 times last night, every time, the damn bottom half would rattle.

This morning, I got up, and took the RIS off AGAIN, and just studied them. On the TOP portion of the RIS, there's a small 'bolt' with an allen head in it that holds what looks like a small bracket that the Delta ring attaches to, the bracket goes around the gas tube...this little piece was loose. I put some loc-tite on the bolt, snugged it down about a 1/4 turn past 'snug', and then re-installed...the RIS is as solid as a rock now.

As for the 'bracket', I don't have that part.

Hax


hope it was blue loctite.
Link Posted: 9/15/2010 12:27:57 PM EDT
Originally Posted By rychencop:
Originally Posted By SirHacksalot:
Thanks for the replies guys.

I took off and put on the RIS about 10 times last night, every time, the damn bottom half would rattle.

This morning, I got up, and took the RIS off AGAIN, and just studied them. On the TOP portion of the RIS, there's a small 'bolt' with an allen head in it that holds what looks like a small bracket that the Delta ring attaches to, the bracket goes around the gas tube...this little piece was loose. I put some loc-tite on the bolt, snugged it down about a 1/4 turn past 'snug', and then re-installed...the RIS is as solid as a rock now.

As for the 'bracket', I don't have that part.

Hax


hope it was blue loctite.


It was indeed. I use that stuff when I install rudders on kayaks...stands up to constant vibrations bouncing down the road, endures saltwater...tough stuff.

Hax

Link Posted: 9/15/2010 3:13:11 PM EDT
[Last Edit: 9/15/2010 3:15:22 PM EDT by js308]
Originally Posted By SirHacksalot:
Thanks for the replies guys.

I took off and put on the RIS about 10 times last night, every time, the damn bottom half would rattle.

This morning, I got up, and took the RIS off AGAIN, and just studied them. On the TOP portion of the RIS, there's a small 'bolt' with an allen head in it that holds what looks like a small bracket that the Delta ring attaches to, the bracket goes around the gas tube...this little piece was loose. I put some loc-tite on the bolt, snugged it down about a 1/4 turn past 'snug', and then re-installed...the RIS is as solid as a rock now.

As for the 'bracket', I don't have that part.

Hax


You have an RAS not an RIS. The RIS does not have that bracket on top. The RAS does have this bracket. The RAS is the newer, better, more solid version of the RIS.
Link Posted: 9/15/2010 3:25:49 PM EDT
Mine has an M5 RAS - as solid as a shit brickhouse.



Link Posted: 9/15/2010 3:59:29 PM EDT
Link Posted: 9/15/2010 4:17:08 PM EDT
I run the Old skool RAS on my 14.5 LMT

Rock Solid
Link Posted: 9/15/2010 4:20:00 PM EDT
Originally Posted By Black-Tiger:
Mine has an M5 RAS - as solid as a shit brickhouse.

http://i15.photobucket.com/albums/a362/Sablelieger/Weapons/DSC00299-1.jpg



Very Nice Rifle!!
Link Posted: 9/15/2010 5:26:03 PM EDT
I had some trouble getting mine on as well back when I started my A4 build. This link helped me greatly though––––->M5 RAS installation instruction in a PDF.
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