AR15/AR10 Picatinny rail mounted sights

[TexasPatriot.308]

I look around assorted catalogs and see open (iron) sights that can be mounted on a "mil spec 1913" Picatinny rail for AR15s. Is the Picatinny rail for an AR platform different size due to the larger frame, or can AR15 sights fit on an AR10. I am looking to mount back up flip up sights on a Bushmaster 308 ORC which has a Picatinny rail on top.

 

[TIMC]

They should be the same.

 

[MrCleanOK]

Picatinny rails are just a dimensional standard. Some manufacturer's stick to it closer than others, but generally speaking you are good to proceed with confidence for most applications.

 

[Skylerbone]

So long as you have the appropriate gas block height any sight will be fine.

 

[Carne Frio]

Just looked at my ORC .308 and it's rail is just like all
the rest that I have, including my Colt 6920. Where are
you going to put your front flip up site ? The gas block
on mine does not have a rail.

 

[Captains1911]

I'm not sure if I understand your question, but Picatinny rail (mil std 1913) is a Picatinny rail. So if your AR-10 has a rail that meets that spec, then and sight designed for that rail will work.

 

[TexasPatriot.308]

my front sight will have to be sight mounted directly on the gas block, they are available in that format. thanks for the info.

 

[Skylerbone]

It was my understanding the ORC has no rail atop the gas block. If I'm wrong then you should be fine. If you're replacing the gas block make sure to buy the correct one (different height than an AR-15). For a direct mount, you should not use Magpul or similar composite sights which may be damaged by heat.

 

[TexasPatriot.308]

no, the gas block has no rail, you must directly mount to it, so if the barrel gets hot, you will want to use a reasonable sight (metal)