Liberal Forum

Huey » 19 Jul 2026, 12:08 pm » wrote: ↑

19 Jul 2026, 12:08 pm

There certainly is:

In order to prevent a civilian semi-automatic AR-15 from being readily converted for use with the select fire components, Colt changed a number of features. Parts changed include the lower receiver, bolt carrier, hammer, trigger, disconnector, and safety/mode selector. The semi-automatic bolt carrier has a longer lightening slot to prevent the bolt's engagement with an automatic sear. Due to a decrease in mass the buffer spring is heavier. On the select fire version, the hammer has an extra spur which interacts with the additional auto-sear that holds it back until the bolt carrier group is fully in battery, when automatic fire is selected.[24] As designed by Colt the pins supporting the semi-auto trigger and hammer in the lower receiver are larger than those used in the military rifle to prevent interchangeability between semi-automatic and select fire components.[25]

https://en.wikipedia.org/wiki/Colt_AR-15#Comparison_to_military_versions

As you can see the lower was completely redesigned.

You lose.