Mossberg Shotguns 500 / 835 & Maverick 88 Trigger Spring Kit

I first heard of this company and product when I watched the TFB Maverick 88 torture test video and decided to give it a try.
I have 3 Mossbergs; 2 M835s and a Shockwave. The first 835's trigger pull was reduced from 5# to 4# . The other 835's trigger pull was reduced from 6 1/4# to 5#. The Shockwave's trigger pull was reduced from 6 1/2# to 4 1/2#.
This is about what I thought was realistically to be expected from a spring kit so I'm happy with the result.

My gunsmith highly recommended MCARBO products, so I purchased this product based on his recommendation. Installed this trigger kit on a Maverick 88. Prior to install the trigger pull was right at 8lbs, after install trigger pull was reduced to 5lbs. POU for this weapon is as primary home defense. For a self defense weapon I'm not sure I'd want to go much below a 5lb trigger pull. Works for me.

Be careful on the 88, the disconnector spring is different and pops out when removing the trigger. The disconnector holds it in place when depressed. I also was not able to remove the disconnector because there was no clearance to wiggle it out. The trigger pin also holds the connector spring on the 88. It loops around the pin. Just look at it carefully before removal of the pin. Luckily I was able to figure it out but the video is a decent reference for how most of this goes together. As far a pull reduction, mine was very poor to start. I'm guessing it was close to 8lb.s and reduced it to 5 lbs. it was an improvement from the factory pull.

I installed this kit in two Mossberg 500s, a 12 and 20 gauge. The kit worked great in both. Installation following the video took maybe 10 minutes for the two. I didn’t measure the trigger pull difference from before/after installation, but it is a significant reduction in the trigger pull. The trigger pull on the 12 gauge isn’t so light that I worry for safety's sake when hunting turkeys. The reset is very crisp too. Do yourself and your shotgun a favor and get a kit, I would recommend this to anyone in a heartbeat.

I ordered a trigger spring kit for a Mossberg 500 and a Remington 870. Order # 526518. The measured trigger pull on the Mossberg 500 was about 6 1/4 lbs and about 6 lbs on the Reminton 870. After installing the kits the Mossberg measured 5 3/4 lbs and the Reminton measured about 5 1/2lbs. Your site stated the reduction in trigger pull would be about 50%, + or - 1lb. Very disappointing.

My Mossberg 500 trigger was 9.9 lbs. when I bought it new. Installed the MCARBO trigger spring kit which took about 15 minutes watching the video and using the wood dowel hammer spring tool I also purchased and got my trigger down to 5-1/8 lbs. Much improved!

I installed The trigger springs on my shotgun. I think maybe you guys should dive into how you can work it on the 590A1. The 590A1 comes with an internal spring on the plunger. A demonstration running the weapon with and without the internal plunger spring by MCARBO would be interesting.
I kept the internal spring on. The the shotgun pumped a lot smoother and the trigger pull was very crisp and the dimple on the primer of the shotshell was, by the naked eye, the same as on shotshells fired by the factory springs.
The trigger weight was measured at a little over 7 pounds. This was measured 3 times at the range using a device that I cannot confirm the calibration of, but it averaged 7.24 lbs. the scale was not mine but from the bench at the range. The measurement was taken in between the tip and center of the trigger.

The wooden spring tool is not good. It was tight in the ID of the trigger housing, left debris and broke too easy. Look into Delrin. It is machineable.

I hope this helps
Semper Fi

Love my new trigger squeeze. Not easy for clumsy hands like mine to replace, but the video definitely helped. My Maverick 88 is very happy.