vvvvvv
Surefire X300 rides on my G22 24/7. No other light I’d even consider on the market.
X300 without a doubt. For more budget-minded people the TLR-1 will work.
Lights I wouldn’t use: Insight Procyon
Another vote for the Surefire X300.
What is it about the Procyon that you don’t like?
I dont care for the independent switching arms, how easy it is to activate the light, how the light flies off certain pistols like the M&P, etc
Thanks for the answer NC !!! I was just curious about it since I have 3 XTI Procyon lights on 3 different pistols and have never had any troubles with light AD’s or them flying off any of my Glocks (~11,000 Rounds fired with the lights on them). I have found the X300 switching to be pretty stiff for pistol duty but just about right for rifle use. It must be hand/finger positioning for me…
I have 3 X300’s on rifles, 3 Procyon’s on Pistols, and another TLR1 on another pistol and they all have been outstanding. Pricewise, it is hard to argue with the TLR1 and Procyon but my rifles will always run X300’s…
X300 on my 19.
I have my M-3 Tactical from way back when they 1st came out.
X300 is a great pistol light, it resides on my G34 at night.
The rusty G34?
Yeah, that one. 
Going to blast/refinish it today or tomorrow.
Im still amazed by that. 
The X300 is the standard. The TLR-1 is decent. However, I prefer the Procyon to the TLR-1.
The Procyon has been through a few changes since NCPatrolAR’s initial experience with them. They now come with milled aluminum lock bars which are MUCH more secure. Insight will provide them free of charge if you have Procyons with the older plastic lock bars. The Procyon also have some of the most holster options available. They will fit in holsters designed for the M3 which means that you can even get the excellent Safariland holsters that will work with or without the light!
I have really come to like my Procyons since the addition of the updated lock bars. However, the X300 is still king.
With the X300 being soooo good, it’s hard to consider others.
Streamlight/Insight M3, M6 need not apply.
They sent my partner an updated locking bar several weeks ago after his light flew off during training and flew apart. I’m fortunate in that mine light is only loose on the gun and hasnt taken flight. I do wish they would rework the controls on it, but I seriously doubt that will happen.
The overwhelming majority has suggested the Surefire X300. It seems $250 is the going price on these units. I see that Grant is out of them. Any other reputable firms that might stock them? Thanks to everyone for chiming in!
Sometimes you can find them used, one went for $150 on TOS EE a while back.
Also you might find the X200 used for a song. Still a viable weaponlight. Not as effective outdoors as the X300. But still good indoors.
That stinks! I will continue to keep a close eye on mine. Your issues with the Procyon have always given me second thoughts about mine. Is there any chance that the adjustable rail wasn’t tightened properly?
One thing I did was tighten the adjustable rails differently than the manual prescribes. Instead of putting it on the rail and tightening it to fit the individual rails on my Glocks, I basically tightened the rail as much as I could while it was off the Glock. That way it is an EXTREMELY tight fit. Thankfully, I haven’t had a single issue with the new lock bars through about 1200 rounds on my G35 (stays on the G21 well too but I don’t have as many rounds on the G21).
It is awful hard to recommend the Procyon with your continued issues!
We have tried tightening the rails various ways with the same results. When we first got them, several guys broke rails trying to eliminate the play we were encountering.