Originally Posted by lewis314
the 3 and 3.1 are the same internally that's why it is the 3.1. The gsl has the updated reg and internals and quick release.
The 3.1 is just a geo 3 with the AT Pipe kit and beefier grips.
So you could hold a geo 3 and a 3.1 next to each other and do a review/efficiency test. (On both) In perfect conditions where both were lubed, cleaned, etc the same internally, and tuned the same. At the same time.
You would get the same exact efficiency, shot quality, noise signature. And everything else exactly as it was on the geo 3. It just doesn't have macro line.
Where the GSL bolt system is modified and changed from the Geo 3 generation, and is what the Geo 4 generation will be built upon.