What is the best accessory/ accessories you've added?

Though recently installed my regulator has to be tops.

Tophat spacer on my condor! Took it from 1180fps with .25 cal pellet to 930! Simple and cheap! 4 bucks!

Favorite addition is silencers on all 3 rifles. I think everyone has common scope, bipod, bubble levler....etc

My compressor has been the most valuable thus far.

So far, it's the regulator I put on my FX Royale 200.

I'd say my NC and DD silencers for sure !!! The sound of nothing happening when you fire gun is great !! Keeps nosey neighbor at bay

It would have to be between the barrel-clamp bipod I tweaked to fit the underlever on my Hatsan 155 and the Williams Peep Sight on the 135. I'm shocked with how much the peep sight has increased my knowledge of proper hold technique and ballistic properties.

All nice toys added fellas!!!!

LDC's and scope levels.

I'd say my ATN X-Sight for night time rat shooting. It opened up a new area of pesting which is a real blast. Bill

The LDCs on the air guns.

Regulator may well appreciated on the AT 44-10 Long if I ever installed one, though I am not sure what I would need to set it for if I bought and installed it.

The small laser on my Weihrauch HW 45 .177, with the see through mount that allows me to use the iron sight as well - and shoot from various positions. Did the same to my fx Ranchero too, but combined with a scope. 
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Boy I have to say I think AJ is right for PCP's my compressor and CF air bottle are priceless! Hand pumping 500 cc guns is not fun and I would not enjoy this sport nearly as much. Second best accessory would have to be a good bench rest set up.

My Trigger Stick is the only accessory I use. My off hand skills are suffering though. Have fun, Scott

As much as I love my guns to be quiet I can shoot them without an LDC on them, but with my not so great eyesight I have to use a fairly good scope. So for me I would have to say the most valuable accessory for my guns is the scope, Neil.

With my Gen 1 Marauder, it would be the Hammer Debouncing Device (HDD) that Steve in NC developed and AoA distributed. Now that the Stopping Spring Guide (SSG) information has been distributed, this may be the most important one for my Crosman 2300 S and Armada. If these work out as well, I may make one for my Marauder and remove the HDD.