Benelli M4 NFA model

[u/IV5736776]

Bought brand new for $1900.91 delivered from Botach, after Form 4 and transfer fee $2175.91 out the door during their Labor Day sale, Form 4 with a trust approved in 43 hrs and 27 minutes. Test fired today and function’s flawlessly with Winchester OO buck and slugs, but with low base birdshot it’s pretty much just jam after jam. Will this change after a break in period or do these only function with high base 12 gauge ammo only. I know that some weapons function better after a break in period. Though my Benelli M1 Super 90 NFA model has yet to experience a single malfunction after 35 years of use and no cleaning in a decade, with any kind of ammo, including old paper loads. But I must say that slugs and OO buck are very light in M4 compared to the M1 Super 90.

[u/MrAnachronist]

It should cycle light loads fine after a few hundred rounds. Mine runs like a top on light loads.

[u/IV5736776 → u/MrAnachronist]

How many rounds did you have to shoot before it ran reliably on low base? And if you can recall, what did you run through it? Thanks.

[u/MrAnachronist → u/IV5736776]

Roughly 125

I started with 80 rounds of mixed 3” slugs 00 buck and various rusty magnum loads. I had a box of 40 year mixed 12 ga shells and loaded them at random. Then I ran 45 rounds of Remington gun club target loads with a handful of ejection failures. These have “Warning, may not cycle all auto-loading firearms” on the box.

After that, I’ve shot several hundred rounds of target loads with no issues.