Remington R5 RGP
R5 RGP is a carbine that was designed and manufactured by Remington Arms. It is an AR-15 type rifle which uses a unique mid-length gas piston operating system in an attempt to improve the reliability of the weapon, and featured a monolithic upper, as the upper receiver and handguard were machined as a single piece.
Produced in 2011, the Remington R5 RGP also featured a unique handguard that included "Q-serts" which held screw holes that allowed Picatinny sections to be screwed into and directly interface with the handguard. This mounting system predated the use of KeyMod, founded by VLTOR in 2012, and M-LOK, founded in 2014 by Magpul Industries.
The R5 was available from Remington until some time prior to 2016. A Remington representative compared it to the expensive HK 416, and that how the R5 was double the price. It is assumed that the weapon did not sell as expected and was thus removed from offer.