[Montrala]

Darn, I missed your post BEFORE I went and installed Geissle SSA-E. However, a club member loaned me his lower with a Stag hammer and it worked just fine.

Ok, so opinions of the "best tigger/hammer" from the list?

I have good experience with JP trigger and with CMMG 2-stage trigger (2-stage is better for precision shooting). Now I have Wilson TTU-3G, but did not use it enough to endorse it. Interesting option is AR-Gold Trigger*. It is 2-stage so good for precision, but also very short reset for fast shooting.

* - Officialy it is not HK compatible, but two my fiends used this trigger in their MR223 and it worked.

 

[joeblow9999]

I have good experience with JP trigger and with CMMG 2-stage trigger (2-stage is better for precision shooting). Now I have Wilson TTU-3G, but did not use it enough to endorse it. Interesting option is AR-Gold Trigger*. It is 2-stage so good for precision, but also very short reset for fast shooting.

* - Officialy it is not HK compatible, but two my fiends used this trigger in their MR223 and it worked.

Montrala, can you use any of those triggers and still use the safety when the hammer is uncocked (in generic lower)? I noticed that the Geissle HK MR556 works but you can't use the safety unless the hammer is cocked. Odd, not that one necessarily needs the safety while bench shooting.

 

[Montrala]

Montrala, can you use any of those triggers and still use the safety when the hammer is uncocked (in generic lower)? I noticed that the Geissle HK MR556 works but you can't use the safety unless the hammer is cocked. Odd, not that one necessarily needs the safety while bench shooting.

Only original HK 2-stage trigger allows to put weapon of safe with hammer down. Once you start to change triggers, you loose this feature.

 

[Spleen]

Is that, perhaps, the reason why geissle made a separate hammer for HKs? Is it just this safety function? Because I've been using mine with a regular SSA for a while now. Has anyone said what the geissle HK specific hammer adds?

 

[Montrala]

Is that, perhaps, the reason why geissle made a separate hammer for HKs? Is it just this safety function? Because I've been using mine with a regular SSA for a while now. Has anyone said what the geissle HK specific hammer adds?

Separate hammer for HK in Geissele triggers is needed to work with automatic firing pin safety. It has nothing to do with manual safety.

 

[tommyPL]

Only original HK 2-stage trigger allows to put weapon of safe with hammer down. Once you start to change triggers, you loose this feature.

Not true. I've got the adjustable UHL match trigger (designed for MR308) which is compatible also with MR223A1 and you're able to put weapon on safe with a hammer down.

You can adjust trigger weight from 1000 to 2750 grams (2.20 - 6.06 lb.).

Cons: quite expensive, got some issues with a hard primer ammo.

 

[tommyPL]

UHL works, however it has wery weak hammer spring.

They have sent me a new one/stronger one from UHL when I called them and mentioned about some issues with a hard primer ammo.

Here are some pics of my MR223A1 with the UHL trigger:

 

[Montrala]

Not true. I've got the adjustable UHL match trigger (designed for MR308) which is compatible also in MR223A1 and you're able to put weapon on safe with a hammer down.

Wasn't aware of that. Anyway still not available for our US friends. Even if it was, they would never accept price.

BTW Did stronger hammer spring change trigger weight?

 

[Spleen]

Montrala, owe you a big apology. I've been trying to figure out why my SSA trigger group worked fine with my HK, finally took a couple of my lowers out to check out what was going on. Found the original bag from my geissele and only the hammer was in it. My HK had the SSA in there but with a different hammer (I guess left over from some personal experiments of mine a year ago or something!) Put the whole SSA kit in together and it definitely does not engage the safety. So I hope I don't confuse anyone with my earlier posts thinking SSAs worked fine. Got all my trigger groups set up together and a KAC group on the way for my HK. (KAC being my second favorite and most trusted manufacturer!)

So, sorry for the earlier confusion and thanks for doing us all a wonderful service with this list.

Definitely not knocking the SSA it's a great trigger and I'm sure I'll find a home for it in another gun.

 

[Alfred]

Sorry Iv'e asked this on another thread but i haven't gotten any answers.
If I drop a Geissele super dynamic combat trigger in my mr223 will it function? Pointblank's sticky on Hk416 and mr556 faq shows that if the hammer is not notched it should worsk. The hammer on the Geissele super dynamic combat is not notched... But then again i read here that the geissele SSA will not work but something like the Timney skeletonized ar-15 will work...
So if the Geissele super dynamic combat doesn't work, why would the timney work?
I realize Geissele have a trigger for the mr223 but it's not available here plus the price is just crazy...
I really want the super dynamic trigger because I love the flat trigger feel.

Sorry again fr being so persistant but i want to understand!

Thanks for bearing with me and answering my questions.

 

[pb_removed]

Sorry Iv'e asked this on another thread but i haven't gotten any answers.
If I drop a Geissele super dynamic combat trigger in my mr223 will it function? Pointblank's sticky on Hk416 and mr556 faq shows that if the hammer is not notched it should worsk. The hammer on the Geissele super dynamic combat is not notched... But then again i read here that the geissele SSA will not work but something like the Timney skeletonized ar-15 will work...
So if the Geissele super dynamic combat doesn't work, why would the timney work?
I realize Geissele have a trigger for the mr223 but it's not available here plus the price is just crazy...
I really want the super dynamic trigger because I love the flat trigger feel.

Sorry again fr being so persistant but i want to understand!

Thanks for bearing with me and answering my questions.

The "notched" thing really only applies to mil-spec style hammers. Drop-in or "match" hammers are pretty much on a case by case basis. Leaving the rest of the rifle intact, the only Geissele triggers I found to function 100% are those specifically designed for HK's (be it 416 or MR556). For example, I attempted to use the full-auto Geissele SSF and the results were poor and sporadic. This was due to the inadequate height of the hammer's strike face; the firing pin safety wasn't properly disengaged.

Not 100% on this, but you might be able to mix and match an HK-specific Geissele hammer with the SD trigger. Again, not 100% if you can do this (can't see why one couldn't though)...just a thought.

 

[Alfred]

Thanks Pointblank! you think i could use the geissele flat combat trigger with the stock hk mr223 hammer? Or is that a complete noob proposition?
Will geissele sell the hk hammer separatly? I really want to use that flat trigger...

 

[tlrgsxr]

Pointblank is referring to the sd trigger with the Geissele Mr specific hammer. I had the same idea, asked Bill, and he told me no.

Eta: I ended up removing the firing pin safety to allow me to use any trigger. I'm NOT suggesting you do the same. With a mil spec action spring it dimples the primer less than a regular AR when chambering.

 

[Alfred]

ok so after researching this trigger mess all night, i found this thread. That was extremly informative and i want to thank member Turbo-j for finally making it clear! Hammers need to be at least 7/8" tall to disengage the firing pin safety. Geissele triggers are 3/4" tall...

http://www.hkpro.com/forum/hk416-hk...um/hk416-hk417-hq/80049-hk416-sbr-upper-compatibility-w-semi-auto-lowers-2.html

I really want to use that geissele sd trigger in my mr223 but i don't feel great about removing the firing pin safety. I have a very competent gunsmith and i wanted to know if modifying the firing pin safety so that I can fit my trigger in the way shown in that thread would allow me to keep the gun as safe as if it was left untouched while allowing me to instal that super dynamic trigger that I love so much?
Will this modification keep me safe from slamfires or would it still be a gamble? I don't like to gamble...

 

[tlrgsxr]

Instead of modifying the firing pin safety lever, it would probably be easier to just fab another one with slightly different tail geometry to function correctly with standard Geissele hammers.

 

[Alfred]

yes that would definitely be an option, but i want to make sure the safety stays 100% operational.
Any input on that would be great cause thats way beyond my technical knowledge and reach. And even though my gunsmith is skilled he probably never had to deal with a similar request concerning an AR type rifle so any imput by the big boys would be appreciated!

 

[Americanel]

I have tryed the Geissele SSF in my mr223a1, all ok but when magazine is out of bullet and bolt is open i can put in safe but the selector is very hard, rubs as if it is hard to scroll, i remember with Factory Hk trigger i did not have this problem, pointblank have changed the selector group with aftermarket, who have do same? and what's group have buy?


news
i have found problem with Pointblank help, need to change selector with Aftermarket

http://www.hkpro.com/forum/hk416-hk417-hq/155443-mr556-ambi-safety-mil-spec-trigger-hammer-difference.html

 

[bigbang]

I have an Uhl in my MR223 and it worked perfectly. No issues with stubborn primers. But only with the heavy spring set I can keep the necessary 1360 grams.
Wolf

 

[Titan74]

Do all MR556/HK416 compatible triggers work 100% with MR762/MR308/HK417 as well?
Some manufacturers have different models for .223 and .308 and usually the ones for AR-10 type rifles come with a heavier hammer (e.g. Timney AR-10 modular trigger: would that work with MR762?).

The factory trigger in my MR308 could be smoother, crisper and lighter (more like SSA-E). How much could be done to it with a typical AR trigger job? I'm looking for a trigger solution that would better fit DMR role and do not want to compromise reliability even with hard primers.

 

[Vonbongo]

Do all MR556/HK416 compatible triggers work 100% with MR762/MR308/HK417 as well?
Some manufacturers have different models for .223 and .308 and usually the ones for AR-10 type rifles come with a heavier hammer (e.g. Timney AR-10 modular trigger: would that work with MR762?).

The factory trigger in my MR308 could be smoother, crisper and lighter (more like SSA-E). How much could be done to it with a typical AR trigger job? I'm looking for a trigger solution that would better fit DMR role and do not want to compromise reliability even with hard primers.

Contact Bill Springfield and see what he says. He does wonders with stock single stage triggers.