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Review
Please watch the entire video without skipping any parts or you may end up like me who spent a good two hours trying to correctly insert the sear housing back to where the pin could become flush on both sides of the pistol grip again. Overall, this kit combined with the synthetic grease for 2 bucks, is 100% worth the small cost to make the stock trigger better. No more grittiness in the build-up to the trigger pull, the pull itself is not so heavy anymore, and even the reset feels cleaner. Highly recommend this product if you don't want to drop 150+ bucks on an apex trigger.
Installed the spring kit into my brand new FN509C and there is a noticeable difference in the trigger pull. The video was an excellent source and I don't think I could have done it without it. The little trick of adding lube where the trigger interfaces with the body was awesome. Helped the grittiness of the initial trigger pull tremendously. I would highly recommend getting this trigger spring kit and following the instructions in the video.
I have actually purchased 2 FN509 Spring kits. I will describe both of the below. The first one was for my FN509 Tactical. That gun already had the APEX Trigger and heavy duty Striker installed prior to installing the M-CARBO Spring Kit. The Spring Kit reduced the trigger pull to just below 4lbs. However, I was frequently experiencing misfires do to the heavier APEX Striker. I put the original Striker Spring back in and that resolved the misfires. With the original Striker Spring, the final trigger pull was 4.5lbs. The second kit was installed on the FN509 Compact. This time a kept track of the impact from the various springs and polishing. Below is the sequence in which I modified the trigger: - Original Un-shot Gun: Trigger Pull was 7.5-8 lbs with significant Take-Up Grit. Wall was clear, however some Creep and a little Overtravel. Reset was fine. - After Shooting 150 rounds: Trigger Pull naturally reduced to about 6.5 lbs I then added M-Carbo Reduced Spring Kit in the following order: - After changing Striker Block Spring the Trigger Pull remained unchanged at 6.5 lbs - Then changed Striker Spring which reduced Trigger Pull to 5 lbs along with about 70% reduction in Take-Up Grit - Polished inside and outside of Striker. The Trigger Pull weight was unchanged at 5 lbs but Take-Up Grit was now about 80% gone -After changing Sear Spring and Disconnector Spring, the Trigger Pull reduced to 4.5 lbs The FN509 Compact still has more creep than my liking. The FN509 Tactical with the APEX Trigger is near ideal with virtually no creep and little over-travel. I will probably update the FN509 Compact with the APEX trigger in the near future.
Greatly reduced pull weight of the trigger but got around 20% light strikes when used with apex heavy duty striker, but once stock striker was reinstalled it worked great!
Installed in FN 509 ls edge. Stock trigger was ok but trigger pull wasn't consistent, between, 5lb 5oz to 6lb 1oz from the lower part of trigger. After install, trigger pull is still not consistent but reduced to the 3lb 5oz to 3lb 11oz. There are reduction in reset tension but still acceptable for competition use. Recommended.
Best $20 upgrade you can buy! You won’t regret it. Get a couple AR15 spring kits while you’re at it!
The trigger pull on my fn509 tactical was way too heavy. It was so heavy that I really didn't enjoy shooting it so I did use the m carbo spring kit and now the pistol is very enjoyable to shoot. There is just one problem. I do get light primer strikes not all the time but it is a little irritating before Never did I ever get a light primer strike. I still gave it a five-star rating even though I am getting light primer strikes.
I bought the spring kit like 2 weeks ago or more. I wasn't sure if try them or just go with the Apex upgrade. But sometimes was screaming to my ear "try it"! So last Sunday late night I install it. For my surprise was very simple (with the install video). After I finish I check my trigger with a trigger scale and from 6.5 lbs went down to 3 lbs.... What 😳. It's a beautiful mix of a really nice defined wall, a really crisp break and a really good reset. Then I went to the range and try 60 rounds at 10 yards. The big holes was slow shot, the head shot was at 12 yards away. And yes, I only shoot one. And the rest was rapid fire. If not a great group, but it is really good. Just Iron sight. (I can't find the holosun 508t v2 anywhere. But my final impression is... BUY IT! Test it. And then you decide if you want the full upgrade. Maybe I will do the full upgrade, but not in the near future. That good is it! Again, just buy it!
From 6.5 lbs to 3 lbs. It's like a new gun. I shoot this at 10 yards. With iron sights. It's not a great group but, it's good. Again I can tell you how different (in a good way) this simple upgrade will benefit. Do I need an Apex trigger upgrade now... No! Maybe in the future, just for the flat trigger. So in my opinion do this upgrade first, then you decide.
I polished the striker parts and the sear parts when I install this spring kit. Huge!! Improvement. Excellent product, top notch customer service. Email confirmation from the moment I order then at all stages of shipping/delivery and they are still coming. I have referred anyone who will listen to me to your website. I can’t thank you enough. Very helpful detailed videos too
I polished the striker parts and the sear parts when I installed this spring kit. Huge!! Improvement. Excellent product, top notch customer service. Email confirmation from the moment I ordered, then again at all stages of shipping/delivery and they are still coming. I have referred anyone who will listen to me to your website. I can’t thank you enough. Very helpful detailed videos too
To say I was a bit disappointed with the stock FN 509T trigger is a gross understatement....it was TERRIBLE!! LOL!! So, after already having installed a couple M-Carbo spring kits in other firearms I figured I would give the 509T some M-Carbo love as well. All I can say is....WOW...What a HUGE difference!! There is still a bit of creep but the pull weight was reduced CONSIDERABLY and the reset is super smooth!! My pull weight went from 7.7 pounds stock down to 4.6 with the M-Carbo kit!! That's 3 pounds of pull weight reduction!! Thanks guys for another amazing spring kit!!