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Builder's Guide to AR-15 Upper Receivers

Posted by 80-Lower on Jan 14th 2020

Builder's Guide to AR-15 Upper Receivers
( This guide is part of our Master Guide to AR-15 Parts) The AR-15 platform's lower receiver is relatively standardized. Opportunity to customize your build truly begins with the stripped upper … read more

Builder's Guide to AR-15 80% Jigs

Posted by 80-lower on Jan 2nd 2020

Builder's Guide to AR-15 80% Jigs
If you're ready to build your first AR-15 from scratch, you'll first want to  understand the concept of the 80% lower receiver. If you're already "in the know" and want to start building, th … read more

Builder's Guide to AR-15 Buffers & Weights

Posted by 80-Lower on Dec 19th 2019

Builder's Guide to AR-15 Buffers & Weights
Like the gas system, the AR-15's buffers play an important role in controlling recoil and, more importantly, assisting the bolt carrier group's travel so it can reliably cycle whatever ammunition y … read more

Builder's Guide to AR-15 Gas Systems

Posted by 80-lower on Dec 11th 2019

Builder's Guide to AR-15 Gas Systems
This next section of our  Master Guide to AR-15 Parts for builders dives into the components and functions of the AR-15's gas system. Learn the differences between direct-impingement and pis … read more

Builder's Guide to AR Bolt Carrier Groups

Posted by 80-lower on Dec 9th 2019

Builder's Guide to AR Bolt Carrier Groups
The bolt carrier group (BCG) is one of the most important moving parts in the AR-15. It takes the brunt of the recoil produced by the gas system while reliably cycling and ejecting ammunition. This … read more