PatriotDefense

that might be two complicated because with the spring installed does that make it an AOW or possibly a Destructive Device requiring further paperwork and licensing from the ATF since it destroys deep space satellites?

You guys are killing me with this flip flopping back and forth on spring weights. First its "lets go as light as possible" now it's "i want to set off depleted uranium cuped primers........". How bout we do a 22lb hammer spring and call it good.....

pretty much summed it up in a simplified way.... Thanks!

Best bet is to cut coils off either one in the meantime..... the down fall to this is some guns require so many coils to be cut that the firing pin becomes stuck in the breach face or in front of the FPB. It will amaze you how much harder of it hit you get with the lighter firing pin spring. I just got word that our next batch of firing pins have been shipped and headed back to us from heat treat. so be on the lookout by about Monday for them.

By no means are ours perfect, I'll be revisiting the design of the ones that tested lower than advertised. I would prefer to be slightly higher than the advertised spring rate to give a little room for margin or error in manufacturing. Im sure we can run this a few more times with a different batch of springs and get different results. It seemed that the Wolff springs varied greatly between one another, and the EG and PD springs where much closer between the 3 test springs used for that model.

Oh Ya, they differed by 2-3 coils and had 2-3lb difference between springs of the same model.

Ok.... so we spent some time testing the actually Spring Rate of various hammer springs used for our beloved Tanfoglio Pistols. The information below was compiled by taking the average of 3 compression cycles across 3 samples of the same spring. So basically we ended up with 9 compression cycles for each given spring sample (all springs where brand new at the start). Test machine was Chatillon CS-225 Digital force tester with up to date calibration certs. Factory Hammer Spring- Average of 18.8lbs Wolff 13lb Hammer Spring- Average Spring rate of 14.1lbs Wolff 14lb Hammer Spring- Average Spring rate of 14.6lbs Wolff 15lb Hammer Spring- Average Spring rate of 16.6lbs EG Light (13.8lb) Hammer Spring- Average Spring Rate of 14.1lbs EG Medium (15.5) Hammer Spring- Average Spring Rate of 16.5lbs Patriot Defense 10lb Hammer Spring- Average Spring Rate of 9.8lbs Patriot Defense 12lb Hammer Spring- Average Spring Rate of 12.4lbs Patriot Defense 13lb Hammer Spring- Average Spring Rate of 13.2lbs Patriot Defense 14lb Hammer Spring- Average Spring Rate of 13.8lbs Patriot Defense 15.5lb Hammer Spring- Average Spring Rate of 15.1lbs So as you can see some of these spring rates across the various manufacturers are pretty close yet give us totally different feels in the guns. a lot of this has to do with the overall design (length, coil count, wire diameter, ID, OD) of the spring as well as material used. One large factor this doesn't take into consideration is the amount the OD of the spring increases as its compressed, this here is your leading cause of the felt "stacking" in guns. Basically the OD of the spring ends up contacting the spring pocket wall which creates drag and increases the felt trigger pull as your now battling friction.

Just reiterating what Johnbu said about the firing pin spring setup your running. The one that comes with the Wolff recoil spring is extremely stiff and your loosing a lot of energy through that spring.

Like Butter!!!!

On the trigger pull gauge we had a full 1 pound difference in DA between our 15.5lb spring and the EG medium. As stated before we had no issues eating whatever we put in the gun....... descent polish job, go fast parts, and a properly reamed chamber.

I fat fingered the thread above the EG medium was 16.5lbs......average.

It's advertised as a 16lb-17lb (ish) spring, however the average across 5 different factory springs gave us just shy of 18.8lbs

It broke the machine......

On a gun that had a 5.5lb DA with a 12lb spring the 15.5 brought it up to a crisp 7.5lb DA and the SA increased from 2.2lbs to 2.6lbs. Its launching about 3-4" below the EG medium spring in DA however the EG medium spring we used came in at a whopping 16.5lb spring rate. We ran through 50 DA only shots with feds, wins, CCI, Wolf, and S&B with no light strikes what so ever. The gun has about 20,000rnds through it, nothing to special on the polish job, and of course all the go fast parts. I think this will be your answer for you guys that find it acceptable to have a heavier trigger pull weights and a gun that eats just about everything. Hope you enjoy, its color coded pink by the way for easy identification.

Should be on the website this evening.......

We've noticed for the first 3-5K rounds through a Tanfo it's best to clean every 600-800rnds. After that you can really stretch out your detail cleanings to 2-3K rounds through the gun..... if you choose.

Yes you can...... However you need to ensure you can cut the hooks and keep them straight and concentric with the sear face. You'll also need to re-profile the hook angle in order to prevent a hammer hook to sear face interface that could cause inadvertent hammer drop or release and make the firearm unsafe. Its not as easy as "taking a bit off the top"......

The creep you guys are seeing is strictly a Hammer/Sear interference issue. Nothing more nothing less, it's taking that much trigger movement to lift the Sear out of the hammer hooks due to an inefficient cut on the hooks or possibly the hooks being to tall. Only way to properly cure this is cut down the hooks and then re-profile the hook angle to ensure the Sear doesn't slip off to early or inadvertently.

Sounds like he blew through the wing on the BOLO, he shouldn't have a problem popping Feds with those spring weights.....

If it's camming back your probably right about the angle of the hooks, hence why we get such good results after cutting the Titan hooks back and slightly re-profiling them.

@IronArcher I think you have some other issues going on in your gun that's accompaning what your seeing. I just glimpsed through your other thread about your safety no longer working in your gun, and you still have the factory hammer, and Sear installed, correct?

You can cut the wing/wings off of an interrupter and it will not affect your SA pull/break.

MM is correct, a BOLO will require some fitting to function properly with a delta. Without knowing what exactly has been done or installed it's hard to throw any remedies out.

He's not having a problem in DA, it's his SA that he's seeing a large amount creep. Dual wings could possible help out in DA As the trigger is pulled since the trigger bar cocks the hammer by pushing on the front faces of the disconnector "wings". As the trigger bar moves back, it is pushed down by ramps on the underside of the ejector cage. When it is pushed down far enough, the trigger bar slips under the wings of the disconnector and the hammer drops.

The BOLO eliminates/reduces the amount of pre-travel/takeup on the SA pull by "pre-loading" the trigger bar as far back in its pull as possible (if done correctly). Once you hit the wall in your SA pull the rest of the trigger pull is lifting the Sear out of the hammer hooks by the trigger bar riding the Sear leg that it contacts in order to lift it in SA. In his videos it does seem like he's got a rather short take up but pulling quite a bit to release the Sear from the hammer hooks......