Rail System Help
 

I'm currently in a fit between two guns, both are G&P
G&P Sentry
http://www.torontoairsoft.com/GP-Sen...CK_p_2067.html
G&P TMR
http://www.torontoairsoft.com/GP-16i...CK_p_3989.html

I'm wanting to put on this rail
https://taktikairsoft.com/product/12...l-metal-black/

But I'm not sure if it will fit because of G&P's imperial barrel threading. Would the rail fit better on G&P sentry because of the same mounting hardware? I'm worried that it may be incompatible.

Apparently the M4A1 RISII is supposed to fit both
Check reviews on madbull's DD rails

http://madbull.com/catalog/en/produc...a1-ris-ii.html

I tried clicking on the link to the the review by Airsoft Ukraine but access was denied for some reason. Also tried googling nothing really came up.