I am in search of some confirmation bias for some builds in working on. In order to combat the general issue many folks have with large-frame build spec inconsistencies (especially when slapped together with parts lying around), I have a few questions that have come up in my research on here.
I have the following goals:
1. To make use of all the 6.5CM and 308 ammo I have lying around, I want to build out a 6.5 Manbun and .308 setup.
2. I’d like to make the most use of parts I currently have in my safe.
3. Buy parts that will allow me to operate these two calibers by utilizing the same lower and swapping out the upper receiver.
To that end, I plan on using only proof CF barrels (already have them in 6.5 and .308). Intended use is hunting (90%) and 800-1000 yd shooting (10%), both with NODs/Thermal when the coyotes get bad. When hunting, max range I would go would be 250 yds, so I don’t need same hole accuracy, but sub MoA would be ideal.
I also have a JP large frame BCG with a .308 bolt.
I currently have a GGP billet upper receiver and handguard lying around.
I am thinking I can purchase another GGP billet upper and lower receiever, and if the tolerance and spec gods are kind to me, said lower receiver set can serve as the common lower receiver for both the 6.5 and .308 upper.
To get around the headspace issue, since I would be using proof CF AR prefits and a JP BCG, I would just need to move the bolt and lower receiver from platform to platform when I want to go from real man (.308) to hipster (manbun).
Am I missing something here with this approach? Should I just stop being a cheap bastard and pay for two lowers? Before you chime in to say I’m trying to do something the platform was not designed to do, understand the goal here is to make use of the parts I have at my disposal while keeping capex at a minimum.
I have the following goals:
1. To make use of all the 6.5CM and 308 ammo I have lying around, I want to build out a 6.5 Manbun and .308 setup.
2. I’d like to make the most use of parts I currently have in my safe.
3. Buy parts that will allow me to operate these two calibers by utilizing the same lower and swapping out the upper receiver.
To that end, I plan on using only proof CF barrels (already have them in 6.5 and .308). Intended use is hunting (90%) and 800-1000 yd shooting (10%), both with NODs/Thermal when the coyotes get bad. When hunting, max range I would go would be 250 yds, so I don’t need same hole accuracy, but sub MoA would be ideal.
I also have a JP large frame BCG with a .308 bolt.
I currently have a GGP billet upper receiver and handguard lying around.
I am thinking I can purchase another GGP billet upper and lower receiever, and if the tolerance and spec gods are kind to me, said lower receiver set can serve as the common lower receiver for both the 6.5 and .308 upper.
To get around the headspace issue, since I would be using proof CF AR prefits and a JP BCG, I would just need to move the bolt and lower receiver from platform to platform when I want to go from real man (.308) to hipster (manbun).
Am I missing something here with this approach? Should I just stop being a cheap bastard and pay for two lowers? Before you chime in to say I’m trying to do something the platform was not designed to do, understand the goal here is to make use of the parts I have at my disposal while keeping capex at a minimum.
