I am looking for a rail system that can be dropped in without removing the barrel. Ideally, I was looking for a smooth modular rail like the VTAC.

http://www.jprifles.com/1.4.4_hg_mod.php

I would only need rails to mount a PEQ-2 and a tac-light. My rifle does not have delta ring and is fitted with an ARMS SIR.

Hate for ARMS mounts aside, the only thing that seems to fit the bill is the ARMS Spartan Rail system:

http://www.armsmounts.com/default.as...&sub=rails&id=[hsh]56M-CV-EXT

http://www.armsmounts.com/default.as...&sub=rails&id=[hsh]56M-CV-C

Any thoughts or other options?