I'm looking at getting a regulator for my AA S200 .177 and have seen both internal and external regulators for sale. I know the external adds a bit of length to the cylinder but apart from that which is the better option to go for and which make would you recommend. I've seen Lanes, Huma and Altaros for sale but on a S200 in .22 I have it has a Tench external regulator fitted but I can't find any of those for sale. It looks like the external are easier to fit and I'd also look at fitting a quick fill and pressure gauge on the other end of the cylinder.
What regulator brand and pressure gauge would you recommend?
Thanks.