JustC,
Here is some information about the receivers:
Back to the Mountain Rifle -its receiver is the same contour as Remington 700s, so choice of scope mounts is wide. The bolt is one-piece forged. Hinged floorplate is solid steel. Trigger is adjustable (we, my FFL dealer, (Charles Thacker), and I, DID NOT change it in any way). From Magnum Research it felt like breaking glass - at 2 3/4 lbs superb-to put it mildly.
Magazine capacity is five in conventional chamberings and four in their magnum version. Plus one in the chamber. Chamberings are: .270, .280, .30-06, 7mm Rem Mag., .300 Win. Mag., .338 Win Mag., .300 Weatherby Mag., .340 Weatherby Mag., .357 H&H Mag, and .416 Rem. Mag. Then there is a Varmint Edition in a .222 Remington and a .223 Remington.
Nice receivers for under $400.00!
Regards.