Question on 2 to 4" quad rail??

[Sky]

Gonna buy a 20 or 24" AR and both of the guns I am looking at do not have rails that you can affix a bi-pod or front folding sight. Was thinking some bolt on 3" quad rail that goes over the gas block would work. Both of the weapons I am interested in have free float carbon rails and are open at the muzzle end of the barrel. Any suggestions or should I get the quad rail gas block dilly?

 

[JDGray]

I wouldn't attach a bipod to a FSB, but would install a sling stud at the frt of the freefloat tube. What kind of gas blocks do the rifles have? You can buy one with a rail on the top for a folding BUIS.
http://www.rockriverarms.com/index.cfm?fuseaction=category.display&category_id=375

 

[Zerodefect]

Just drill 2 holes it the carbon FF tube to match whatever your bolting on.

 

[Sky]

I really did think there was some quad rail that just bolted over the gas block? I did end up getting the 20" bushmaster, match 2 stage trigger, scope and the whole shebang for what I felt was well below market value for the gun alone.

Anyway I would like a bi-pod and a front flip sight mounted for disconnect. Carbon free float rail is nice and I do not really want to drill or cut into it. Also did not want to have to get a new gas block but I may have to go that way. Just figured someone someplace might know of something.

 

[MrCleanOK]

Putting your bipod on a quad-rail gas block is going to defeat the purpose of that fancy free float tube. Just install a sling stud in the tube and attach your bipod to that. Sights will be another issue. You're going to have a hard time finding a sight you could install on the FF tube, so going to the gas block is really your only option there. If you get a flip-up sight, make sure you get one that is the correct height for a picatinny gas block (which is taller than one for a free-floated, railed handguard). From the description of your rifle, I'm assuming you already have a picatinny gas block. If you don't, you may also consider switching to an integrated gas block/flip-up sight.

 

[Sky]

Thanks

 

[Mot45acp]

scroll a lil past half way: product# YHM-639K
http://yankeehillmachine.com/store/rails.html

I might have one somewhere I can sell cheap, like half price if I can find it.

 

[kwelz]

Just purchase a good QUALITY rail. I suggest with a Daniel Defense or Troy TRX.
The Troy will be cheaper, a bit lighter, and will probably suit your needs a bit better.

 

[Sky]

Thanks for the thread on Yankee Hill..Mot45acp

Azizza wondered where you were!!!

I have a 5.5" weaver rail I could mount I could affix to the bottom of my fore grip but again that's not an option I am interested in.

There is no front sight on the AR and for that matter no BUIS on the back either. It was intended as a scoped rifle by ????? who ever. Scope works surprisingly well.

I just wanted something I could easily screw over the front gas tube block/connection that would give me an easy block for a bi-pod and maybe a cheap ARMS 71L-F & 71L-R Flip-Up Sights or magpul flip sights. I suppose I should have found and copied a picture pf the barrel to make it easier to explain.

 

[kwelz]

Other have already said it. You don't want to put the Bipod on the gas block. It puts pressure on the barrel and will cause a shifting POI. That is why I suggest a Free float rail. If you want a YHM or other that is fine. but putting it on the Gas block or non FF handguards isn't a good idea.

 

[Sky]

I did a Google search for "picture of a bushmaster 20" predator" and the two pics (listed below) are of the type I have. All their bi-pods are attached to the fore hand grip (swivel)of those I saw. None are done in a way like I was thinking would be easy install and remove when trekking....

Also the magpul PRS stock I kinda want????? any of you guys using them. Sent Tonyangel a Pm I know he has one. Been told they really balance out the weapon but so does the original stock...Just asking for opinions; I do like the cheek rest.

http://jsgunparts.com/store/index.p...ID=635&zenid=33a9fecdb066b37d5b7eeade966eb737


ar151.jpg ar151.jpg

 

[Sky]

Ok forget the bi-pod on the barrel thing!! I will mount it on the ff hand guard. What suggestion on a mount and flip sight for the front...Change the gas block or try to find a Yankee Hill type block to affix to the barrel?

Thanks guys.

 

[kwelz]

If you want a dedicated Gas block and Flip up combo I suggest the VLTOR
http://www.vltor.com/vst.htm

YHM also makes one that I have used int he past.

Oopps. Forgot dedicated gas block with rail..
http://www.bravocompanyusa.com/PRI-Gas-Block-With-Top-Picatinny-Rail-p/pri 05-075-04 gas block.htm

 

[Sky]

Thanks Azizza