I have a 1301 comp 24”. Which tube is best for most capacity without extra ending beyond muzzle? — 1 Answer

Lancer says:
"The best way to determine your desired extension is to measure from the end of the threads to the muzzle and compare it with the lengths given on the Beretta extension page on our webstore"

Lengths are listed at
https://lancer-systems.com/awc/product/beretta/

As well, Lancer states "

Lancer Carbon-Fiber 12 Gauge Shotgun Extension Tubes (LSX) are designed to attach to existing shotgun magazine tubes to provide added capacity to the shotgun.

SELECTING THE LSX
There are two basic methods of selecting the right LSX: total length and total capacity. To increase the capacity of the shotgun without having the extension tube extend beyond the muzzle, measure from the front of the shotgun’s handguard to the end of the muzzle.

Machined aluminum components combined with a lightweight, carbon-fiber tube create a lightweight, durable extension to your shotgun. An extra-long spring is included that can be cut to optimize loading. Extension clamps are recommended for extension tubes that extend beyond the end of the barrel."

Mark H.