Today I encountered problem with Wilson Combat TTU-3G trigger. Problem happened once when shooting from off-hand and on almost every round if shooting from magazine rest. In all cases I was attempting to shoot fast double tap.Trigger was not cocked back for second shot, while new round was chambered. It looks to me like hammer follow, but there was no doubling. Any idea what could happen? Sending trigger back to manufacturer is not an option for me at the moment, so I need to know if either it is shooter error that I can correct or I should ditch trigger group and go back to my spare (CMMG 2-stage).
It is either carrier bounce or a defective part in the TTU.
An H2 buffer would likely solve carrier bounce. A Selector Test may help determine if the TTU is bad.
when you pulled the trigger the second time, was it a dead trigger of did you feel the hammer release and just not fire?
Sounds like trigger spec issues to me. Are you sure the disconnector spring is installed correctly?
It was dead trigger. TTU-3G is self contained unit and was not disassembled or tampered with in any way.
I failed to mention, that while I discovered issue while shooting double taps, it is still here even when I shoot single shots (with trigger held back on recovery) when rifle is supported on magazine.
Anyway, now I went back to my previous trigger, that never gave me any problems (I have 3GN match tomorrow). I will do some testing with TTU-3G later.
If this is happening during semi and rapid fire, AND the hammer is not following the carrier, then it seems like something Wilson will need to fix (a possible disconnector issue).
Mk18’s idea for a selector test is a good one and would also help identify the disconnector/spring/hammer-disconnector interface as the issue. I would let Wilson handle it since trying to fashion a field-expedient fix would likely void your warranty and prevent you from enjoying their good CS.
Today, while packing for a match trip tomorrow, I dropped Wilson back into lower to do Selector Test (thanks, did not know this one). Trigger worked as is should in 20 (or so) repetitions.
Carrier bounce should not be cause of the problem, as it also happened with single shots. But, to rule this out, I will change recoil assembly form JP SCS-15 back to original HK spring and buffer (HK buffer is tungsten powder filled and heavier than H2 buffer). JP system might have to light spring and buffer, however it worked flawless for me for some time. Wilson trigger is there for last mere 700 or 800 rounds. It did not give me any problems initially (but I was not shooting from mag support at this time). Actually I might have a problem once or twice on match in Estonia, but on the stage, when rifle did not go bang, I just did immediate action and did not look into what was the cause.
I would gladly enjoy great WC customer service, but I’m a little “geographically handicapped”. That spoil things. So I first want to be 100% sure it is trigger that is bad and not other stuff I use on my rifle is causing problems. I will try to test trigger also in some friends rifles. One is using exactly same trigger also in HK rifle and never had a problem.
Don’t know if this will help. Make sure the left hammer spring leg is above and resting on top of the roll pin at the rear. The trigger won’t reset properly unless it is. On the Wilson website there is an install video that talks about this.
I knew about that, but thanks. Spring was in proper position.
UPDATE
I still do not know exact mechanism of this problem, but when I removed JP SCS-15 recoil assembly and put back HK buffer trigger returned to normal function. I tested it with same magazines and rested from same bench, with same ammo, to replicate original conditions when I discovered this problem.
I think there were no need to bother Wilson Combat CS. Thanks everybody for help! If I ever will find out how this actually happened, I will update.
you think the buffer may have been out of spec and not pushing the hammer down enough to engage the disconnector?
or maybe the bolt bounced back so far it disengaged the disconnector? I really don’t see that happening. This whole issue is weird.
I have exactly some feeling of weirdness (is there such word?).
Whole issue happened to me only once or twice when shooting double taps off hand, but almost every round when shooting single shots or trying double taps with mag rested on the bench.
When I will have time (not soon) I will try to test with both recoil systems and 200fps camera to see what BCG is doing. I do not have access to faster camera, but I hope it will be enough to see if carrier bounce was source of problem.
I think it’s a combination of these two parts, the WC TTU-3G and the JP SCS-15 recoil assembly.
Neither part is defective, but the operating characteristics are different than standard parts.
The SCS may allow carrier bounce and the trigger is fast enough to drop when the bounce occurs.
Slow down the trigger or eliminate bounce and the problem goes away.
Originally Posted by WC web site
Because of the short, fast reset of the TTU, always use a firm grip and solid hold when shooting from the bench or prone to ensure that bump firing does not occur.
I have 25+K rounds through my 3GTTU triggers in various rifles and will emphasize that what WC says is indeed correct. Firm grip + loose hold + prone = rare double. Very fast double tap + loose grip = rare double. This is still my favorite trigger.
I’m aware of that and I have some experience with light and/or short reset triggers on semi-auto rifles. This was not an issue I encountered.