Bam Margera Says He's Over 100 Days Sober, Gets Shoutout From Mark Wahlberg

Bam Margera is crossing a milestone in his sobriety, and thanking his girlfriend, the gym and skateboarding for helping him stay on the straight and narrow ... all while getting support from Mark Wahlberg.

The former 'Jackass' star tells TMZ … he's over 100 days sober and plenty busy with work and his fitness.

Right now he's in San Antonio working on a movie and developing new artwork for a clothing company. He is still working out daily with his GF Dannii and skating again ... aka the 3 key factors to his sobriety, according to Bam himself.

This week he was working out at a gym owned by Jarred Taylor, one of the founders of the Black Rifle Coffee Company ... who also once worked closely with Wahlberg on the 2013 war movie "Lone Survivor."

As you can see, Bam's working out in a gym covered in images from Mark's movies ... leading to the actor giving Bam a really cool shout-out.

TMZ obtained video of a message Bam sent to Mark, letting him know he was approaching 120 days sober ... and we also got Mark's video response.

Mark's congratulating Bam for his milestone and hoping to connect with him soon in Las Vegas. BTW, Mark's also talked about getting sober this year for health reasons, so they have that in common.

Bam tells us he met Mark a few times back in the day at awards shows and parties, and he's planning to take Wahlberg up on the offer.

BM says he recently got cleared to see his son, Phoenix, so he's planning to drive to California to see his kid, with a stop in Vegas on the way to chill with Mark.