Thread: Remington 700 Bullpup chassis build

Originally Posted by stretch

Nice work. How rigid is the connection between the action and the AR handguard upon which the scope is mounted? Wouldn't that be a critical factor?

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Thank you,
Yes you are right and I dont have many pics of that area but will try to explain how I executed a rigid scope mount.
As it is a chassis not a stock as such, all components had to work in and be locked together. The scope is quite heavy and the AR handguard is thin 6061 T6 and has flex so needed reinforcing and multiple mounting bolts.

The handguard has a custom bushing at the rear like an AR15 barrel nut that fits over the barrel and up against the recoil lug. The handguard bolts to that bush through the sides and underneath.
There is a second press fit bush at the front of the hand guard that holds it central to the barrel.
The action and handguard is bedded in Devcon as a single unit to the laminate bedding block with alloy pillars in 4 locations, two in the action and two in the underside of the handguard. Finally I have milled a stabilizing bar for the top of the rail to stop any flex or twisting, it bolts up on the top front action screws where you would normally mount a scope rail and extends forward under the scope and bolts into the handguard.
It actually shoots better in this chassis than it did in the MDT LSS but that could also have to do with accuracy nodes and harmonics after I shortened the barrel 4 inches.
The scope sits up there rock solid and there is no POI change from cold bore shot to "cook an egg on your suppressor smoking hot" ..

This is the top rail stabilizer being machined, it was not in the first photos as it was duracoated and added later.