Posted: 9/17/2008 11:21:12 AM EDT
| What is the difference between the LEM and a standard trigger? |
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In answer to the question, “What exactly is the LEM trigger?” here is a brief synopsis. In the P2000/SK pistol, as well as an LEM USP/C or LEM HK45/C, the LEM trigger is a DAO light action trigger that has the same trigger pull weight first shot to last. The first shot will have a long but light take-up and then will release the hammer and fire the pistol at a factory pre-set pull weight. In the standard LEM V2 version, the trigger releases the hammer at about 8 pounds of pull. In LEM V1 the pull weight is 5 pounds and LEM V4 the weight is 7 pounds. The various weights are achieved by trigger return spring and firing pin block spring changes. V3 is not an LEM trigger but is SA/DA and it functions and feels the same as the V3 trigger in the USP/C pistol. The LEM light action system uses a two-piece hammer arrangement such that when the slide is racked or a round is chambered (by racking the slide) the lower, unseen part of the hammer is brought to full cock position and the hammer spring compressed. The hammer “spur,” or top part of the hammer, follows the slide forward and the pistol appears to be “decocked” but the pistol is still in a 90% cocked condition. When you shoot, as you pull the trigger the hammer will come back to the full cock position. As you reach the release pull weight, the trigger will release the hammer and the pistol will fire. If you hold the trigger fully to the rear as the pistol cycles the next round, you only have to let off the trigger .3 inch to reset the trigger. At that point the same amount of trigger pull weight, except for the long take up, will fire the pistol again. You will notice that after the pistol fires the hammer will be in the full cock position if you did not release the trigger, but as you release the trigger to reset the trigger, the hammer goes forward about 1/3 the way. After reset, as you pull the trigger again the hammer comes back again to full cock. If you release the trigger all the way then the hammer will go all the way forward into the “decocked” position, but remember, the hammer spring is still fully compressed and ready to fire and will do so with a light, but long pull of the trigger. The hammer spring cannot be decompressed without pulling the trigger so if you wish to do this, there had better not be a round in the chamber! The LEM also has repeat strike capability. If for some reason the pistol does not fire, and you wish to try to ignite the round again, you do not need to rack the slide to pre-load the hammer spring. You only need to pull the trigger again which will fully compress the hammer spring and release the hammer. However, starting from the fully uncompressed hammer spring condition the pull weight will be between 11 and 13 pounds, similar to the DA pull on the non LEM USP/C. After the round fires or you rack the slide (which pre-loads the hammer spring), you will again have the light LEM pull. The standard trigger pull is the normal V1, not the LEM V1. The standard V1 is SA/DA with safe and decock. SA pull is usually around 4.5 pounds, DA pull around 10.5 pounds. Trigger reset SA is about 2.54 inch if you do not let out all the way on the trigger between shots. |
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love my LEM trigger, very predicatble and smooth... not to hi-jack your thread or anything but how can you tell the diff between SA and DA? Mine has the safety removed completely, and the hammer will never cock. the hammer will always stay inside the back of the slide never exposing itself but when firing. I have the LEM trigger too, not sure which one. When dry firing the first pull is normal and the 2nd pull of the trigger is really hard unlesss you re-cock the pistol and dry fire over again. |
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Greetings,
The LEM trigger is very similar to a Para Ord. LDA trigger if you've ever handled one. Secondly, DON'T DRY FIRE YOUR HK WITHOUT SNAP CAPS! Due to the design of the USP firing pin and firing pin block, significant stress is placed on the firing pin during dry firing. Because repeated applications of this stress can lead to firing pin breakage, Heckler & Koch recommends that snap caps be used when dry firing. That was a quote from here: LEM Module, last paragraph. I don't beleive HK sells the triggers seperately, but you can send in your pistol and have the LEM / DA/SA / DAO installed for about $100. This info is a tad old so i'm not sure about the price anymore. This info is also in the above link. Hope that helps Take care |
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You can buy the LEM trigger kits from Robert Johnson for $125, which is the normal price.
Directions come with the kit or you can see them posted in the Handgun Forum on HKPRO. |