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The AR-10 is slightly larger and heavier than the AR-15. It was originally designed to chamber the military 7.62x51 NATO cartridge (also .308), which has a COAL of 2.800" (71.12mm) 45 Raptor , uses the standard 7.62 NATO case, cut to a length of 1.800" from 2.015", resulting in a straight-wall cartridge, neck is sized to 0.452".
The rifle is offered in a series of cartridge options ranging from straight walled such as the 350 legend and the 450 Bushmaster up bottle necked cartridges such as the .243 Winchester, 25-06 Remington, 6.5 PRC, 7mm PRC and 300 Winchester Magnum.
The RPR was originally announced in the following calibers and configurations: .308 Win. with 1:10 twist, 20 in (51 cm) barrel, weighing 9.7 lb (4.4 kg) 6.5 Creedmoor with a 1:8 twist, 24 in (61 cm) barrel, weighing 10.6 lb (4.8 kg)
Shortly after, the 491 and the 691 were launched. These rifles (491/591/691) are not as highly regarded as the L461/L579/L61R and according to folklore, the quality of the workmanship is slightly inferior for the 491/591/691. They featured a separate recoil lug, also found on the 75, and a Tikka trigger assembly.
6.5mm Grendel (6.5×39mm), cartridge designed for the AR-15; 6.5mm Creedmoor, centerfire rifle cartridge; 6.5mm Remington Magnum, belted bottlenecked cartridge; 6.5×42mm, also known as 6.5 MPC (Multi Purpose Cartridge), centerfire rifle cartridge; 6.5×47mm Lapua, smokeless powder rimless bottlenecked rifle cartridge
The rifle is built on the AR-10 platform which takes a 7.62 mm cartridge. [1] The rifle has a Geissele trigger, and Magpul Industries components. It also has a proprietary 4 port Muzzle brake. It has ambidextrous controls The barrel is cold hammer forged, Black Nitride treated, and has. 1:10 twist.
These conversion kits included complete upper receiver assemblies chambered for 6.5 Creedmoor as well as new muzzle brakes, and B5 Systems collapsible precision buttstocks. New QD suppressors for 6.5 Creedmoor were to be ordered separately. [23] [24] [25]
A disassembled Mauser action showing a partially disassembled receiver and bolt. In firearms terminology and at law, the firearm frame or receiver is the part of a firearm which integrates other components by providing housing for internal action components such as the hammer, bolt or breechblock, firing pin and extractor, and has threaded interfaces for externally attaching ("receiving ...