He's 5'9" and about 170, so he's not really a "tiny" dude, He carries a good amount of muscle for a featherweight. I have always wondered if the guy happens to lift often/heavy to keep that muscle mass?
Also interested in this 
I saw him lifting weights during one of the embedded videos, either that or it was in promo vids for Mcgregor vs. Aldo, he was working the bench press.
OnceAndFutureKing - I saw him lifting weights during one of the embedded videos, either that or it was in promo vids for Mcgregor vs. Aldo, he was working the bench press.Heavy weights or no?
Lifts bout tree fiddy or so
I don't think combat sport athletes typically do big numbers for weight lifting.
shogunhoohah - There's a video floating around of him having to struggle in an arm wrestle to the point he had to cheat against a slightly bigger talk show dude.Link?
He's not physically that strong.
He's can probably lift good but not put up insane numbers. He's obviously not focused on power lifting 
Can't imagine him lifting too much. I know in Combat sports a lot of striking coaches are very cautious when it comes to lifting weights.
He does a lot circuits I believe, lower weight and body weight mostly.
Only Aldo's 12 pounds of gold :).
For rising UFC star Conor McGregor, mixed martial arts training starts and ends with control. McGregor’s movements revolve around control of his body, mind, and breath.
“If it doesn’t involve balance I don’t think it’s beneficial,” says McGregor. “I do yoga every day. I’m perfecting my handstand, I like the tree pose with a side leg extension and the plank/side plank.”
Just don’t expect McGregor to get to yoga class on time. The Irish-born featherweight doesn’t keep a schedule in a traditional sense. He simply wakes up and starts moving.
“I’m self-taught, and nothing is set by a clock,” says McGregor. “Yesterday, I did pool work, then went to the gym and did jiu-jitsu rounds, pad work, jump rope, core work, and dead hanging from objects.” McGregor does free-weight exercises such as single-leg barbell deadlifts to build strength and balance simultaneously. His most valuable skill, though, is intangible. “My belief is my best asset, and I have a stronger mindset than my opponent,” he says.
http://www.muscleandfitness.com/workouts/athletecelebrity-workouts/how-ufc-star-conor-mcgregor-trained-ufc-189
^ great article thanks for posting.
I would give him 225 for 1 rep.
Judging by the things he's into I'd doubt it.
Seems like he's into body weight stuff and calisthenics as is ido portal.
Which is smart, he doesn't need to really be lifting weights.
In for pics of Conor's girlfriend doing squats
He mainly focuses on body weight exercises as opposed to weights.
Also arm wrestling is more technique than strength.
Many fighters are lanky. This makes for a good mechanical advantage in striking but a bad mechanical advantage in most lifting. Hes probably good at deadlifts. Long arms actually help with those
I figured he didnt lift heavy, I figured bodyweight and something like kettlebell circuits
shogunhoohah - There's a video floating around of him having to struggle in an arm wrestle to the point he had to cheat against a slightly bigger talk show dude.
He's not physically that strong.
Well, that settles it.