AR-15 Buffer Weights Explained: Carbine vs H1 vs H2 vs H3
What carbine, H1, H2 and H3 buffers weigh, which one your rifle needs, and how to read your ejection pattern to tune it.
Blog
Build guides, part comparisons and picks for your next AR-15.
What Size Gas Block Do I Need for My AR-15?
The four common gas block sizes, which barrels use each, how to measure your barrel's journal, and low-profile, adjustable and pinned blocks.
300 Blackout BCG and Magazines: What Works?
Why your 5.56 bolt carrier group and lower work with 300 Blackout, when magazines matter, and the one safety rule every 300 Blackout owner …
6.5 Grendel Bolt: Why It Needs Its Own Bolt Carrier Group
Why a 6.5 Grendel AR-15 needs a Grendel bolt, what else changes from 5.56, and why 6mm ARC uses the same bolt.
Mil-Spec vs Commercial Buffer Tube: What's the Difference?
Why a stock fits one buffer tube and wobbles on another: the diameter, thread and end-cap differences, how to measure yours, and which one …
Do AR-10 and AR-15 Parts Interchange?
Which AR-15 parts fit an AR-10 and which don't, why DPMS and ArmaLite patterns matter, and how to check before you buy.
What Handguard Length for Your Gas System?
How long your handguard needs to be for carbine, mid-length and rifle gas, how much room to leave for the muzzle device, and drop-in …
AR-15 Gas System Length Chart: Which Gas System for Your Barrel?
A chart of AR-15 gas system lengths with gas port distances and the barrel lengths each suits, plus why mid-length is popular on 16-inch …