AR-15 Short Barrel “War” Is Mostly Noise: How to Make a 10.5 Shoot Like a 16 (With a Smarter Zero)
Meta title: 10.5 vs 11.5 vs 12.5 AR-15 Barrels: The Truth + Best Zero
Meta description: Major Pandemic argues the 10.5 vs 11.5 vs 12.5 debate is overblown—and explains how a 200-yard zero can “true” a short barrel to match 16-inch BDC holds out to ~333 yards.
Everybody’s fighting over AR-15 barrel inches—10.5 vs 11.5 vs 12.5—like it’s holy ground. Major Pandemic’s take: for real-world use, it’s mostly bullshit. After decades of shooting short guns, he argues the performance gap inside that 10.5–12.5 window is so small it’s not worth the internet hysteria.
Here’s the punchline: you can “true” a 10.5-inch setup so it behaves shockingly close to a 16-inch gun for practical distances—without custom reticles or taped dope charts—just by zeroing smarter.
The truing concept
Instead of zeroing a short barrel at 100 and then complaining about drop at distance, Major Pandemic recommends a 200-yard zero on the 10.5. That shift “trues” the short barrel’s trajectory to track much closer to a typical 16-inch, 100-yard-zero expectation—close enough to keep using common BDC reticles (even ones designed around a 100-yard zero) with minimal mental math.
What that looks like in plain English
With a 200-yard zero on a 10.5:
You should be roughly 1.5” high at 50 yards
Around 2” high at 100
Zeroed at 200
About 8” low at 300
And it stays within about ±2 inches of the “expected” 16-inch trajectory out to roughly 333 yards—good enough for banging 4” plates at ~300, which is what these rigs are typically for.
Why the inch-fight doesn’t matter
Past the noise, the drop difference between 10.5 and 12.5 at 300 yards is roughly “an inch-ish” territory—realistically not a make-or-break factor. The bigger win is picking a barrel length that keeps the gun compact once suppressed and then zeroing it correctly.
Don’t be sloppy
Final advice: confirm your zero with the ammo you actually plan to use, avoid steep up/down angles when zeroing, and keep notes on conditions if you want repeatable results. Truing is your friend—use a ballistic app that supports it and make the data match reality.
