CA SIR short type Carbine installation issue

[Xepharo]

Hey guys, recently purchased a CA SIR... it's all nice but... there's one problem.
Where do I put my BUIS?!? There's no rail after the SIR system (metal body wise)? I know there's a BUIS specially designed for the SIR, but.. there's no space for that either.

Here are pictures to better explain the problem.



http://www.stealthcore.com/pic/img_0310.jpg
http://www.stealthcore.com/pic/img_0312.jpg
http://www.stealthcore.com/pic/img_0313.jpg

If I post this in the wrong forum, sorry.

[medhatboy]

I had the same problem when I put the SIR on my CA M15, all I did was mark the spot where the flip up rear sight goes and cut a slot into the top just deep enough for the bar on the sight to go in.

Not a close up but it gives you an idea.

[Godlyspartan]

Maybe its missing an extra Picantanny rail if its not that... Than it could be that your SIR is too far back?

[Brakoo]

I checked with Xepharo and we realised that is body is in fact missing a rail. I don't see how the SIR could be too far back unless he forces it thru his delta ring but that wouldn't be any good.

[Xepharo]

I'm checking with the manufacturers and dealers right now.
Some CA M15A4 metal bodies have 12 grooves, some have 13 grooves. I don't understand why CA would do this.

[Godlyspartan]

Now that is Retarded lol,
I dunno ive seen some misplaced rails on top keke

[Mantelope]

I'm looking at my G&P M4, and I've definitely got at least one more notch on the top at the back. Break out the dremel?

[Xepharo]

Yeah, I thought of doing the dremel job (I suck at it)... but I would rather sell it and get a better metal body... Hurricane maybe.

[Xepharo]

another thing.. forgot to mention, I was just talking to Morbius bout it.
The rails arent up to mil. spec. I had to sell my Eotech 511 cause it didn't fit, kept on falling off.. freaking Classic Army...

[ThunderCactus]

was it too loose? did you shim it so it would stay on there tightly?
and use a file instead of the dremel, slower, but does a much nicer job.

[Xepharo]

It wasn't loose or tight, in fact, it sits side ways on the rail. Fitment issues...too late now...i sold it

w00t number 666 post

[Amazing KG3]

Originally Posted by medhatboy

I had the same problem when I put the SIR on my CA M15, all I did was mark the spot where the flip up rear sight goes and cut a slot into the top just deep enough for the bar on the sight to go in.

Not a close up but it gives you an idea.

I was gonna dp the exact same thing! damn i thought i was being clever too, goes to show how many of the same armalites go. How easy is it to install on a CQB?

[medhatboy]

The gun started as a regular M15, before I put the SIR on I installed the short aluminum outer barrel, then the SIR, it took all of a few minutes, except for the fact that you need a special wrench to get the CA outer barrels on/off. The rear folding sight had the same problem as being discussed, didn't have a slot for it, so I marked where the bar would sit and used a fine toothed hack saw, cut a slot on either side of the space needed to the right depth, then filed the middel out. The gun looks a bit different now then when I took the picture, I've since put the RDS in a low scope ring, and changed the pistol grip to a KA G26 grip.

[Xepharo]

medhatboy, can this all be done by just using the bastard cutter file?

[Nervikaire]

Originally Posted by Xepharo

The rails arent up to mil. spec. I had to sell my Eotech 511 cause it didn't fit, kept on falling off.. freaking Classic Army...

It's not only Classic Army, couple of brands, even RS, don't have a perfect fit with the EO's...