No experience with the GAP but plenty with the NULA. My pop ordered 2 more of them this year, they should be arriving any time now and he's in his seventies, that will make 4 NULAS in his stable of rifles. I handload all his ammo for him and can say from first hand experience that they are very high quality, frighteningly accurate, easy to carry and a joy to shoot. The next custom I order will be from Mel also. Give Mel a call, he will answer everything you want to know about his rifles.
JMHO,
BD