Need another option: Yes, if you want to shoot lead.
I know, others will chime in and say they do it all them time in their stock barrels.
I'm bebating on getting one for my G20SF in 10mm. The glock barrel I have now is just fine, but if I can get even better accuracy out of a lone wolf barrel then I think it'd be worth the $120.
What are your thoughts?
If you want better accuracy, get a fitted barrel. The drop in stuff might help, depending on how the tolerances stack, but probably won't.
What a decent aftermarket drop in barrel will do, ESPECIALLY in 10mm, is extend your brass life. I used a KKM (generally reputed to be better than the LWD ones) in my old G20, as the stocker would leave leave bellies on medium loads and full on smilies on full power 10mm loads. It did not have any appreciable effect on accuracy though.
That's the thing, with my factory barrel I don't get any case bulges with full power loads. I'm using 200gr hornady JHP's over 9.2gr of bluedot. I did do some experimenting while working up a load to the point where I was getting a case bulge, but by that time the brass was flying 30' away and I was clearly over what the books were recommending.
I've heard Glock has tightened up their barrels a bit and added some chamber support. Mine was an early Gen3 and had a pretty generous feed ramp cut. If you're not getting bulge, my $.02 is that a LWD barrel would be a waste.
a 22lb recoil spring helps keep your brass from being launched into low orbit.