As some of you, I'm an avid firearm enthusiast/collector. I just recently managed to spend some range time with my recently aquired FS2K and I will have to say that my expectations were not met. There is a possibility that my expectation benchmark was set high to begin with due to the FS2K's radical and technical engineering design or maybe its also the fact that this rifle is made by a reputable manufacturer and not some sub-standard generic company.
2 different issues are the cause of my rant with this rifle:
1) This rifle has an issue with Lake City's M855, 62grain (penetrator) ammunition. There were 3 instances where a "No Fire" (dud) occurred within 120 cycled rounds or 4 magazines. The ammo can easily be the culprit of these "No Fire" issues but considering that my SIG556 cycled more than 360 of these flawlessly on the same day, leads me to believe that this FS2K is suffering from inadequate pin protrusion. I would need to look into this to find out if there is an issue with the pin itself or the trigger group but if I would need to guess, I would say the trigger group is to blame
2) This second issue been the "Trigger Pull" is no surprise and has been the center of multiple posts in this forum. The trigger pull on my FS2K is rough, heavy and even though you can distinguish the 2 stage, it is still creepy and it just doesn't make this rifle a joy to shoot for me. I've spent several hours researching, analyzing and trying to come up with ways to improve this trigger pull. After basic consideration I believe that the trigger group again, is the culprit of such a mediocre trigger pull.
There are a lot of FS2K fans out there specially in this forum so please try to understand that I'm not here to bash on this rifle. I'm just plainly portraying my un-bias opinion on my initial experience with it. I still consider myself attracted to this rifle even though I have ran into the issues described above. The rifle's bullpup configuration is one of its forte, creating a short, balanced, light and amazingly comfortable firearm (considering its radical looks). Unfortunately the same bullpup design is the demise of a favorable trigger pull as it is seen in others with this design but there seems to be more than the bullpup design causing the FS2K to have a nightmare of a trigger pull. In my opinion FN's decision on constructing the trigger group out of plastic is the cause for both of these issues which I encountered with this weapon. The "No Fire" incidents are enhanced by the fact that the plastic hammer lacks mass or kinetic energy to fully indent the harder primers of surplus ammunition. I'm pretty sure that a heavier hammer or one made out of hardened steel would not have this issue. Now as far as the trigger pull, the plastic construction of the trigger group is one of the contributors to a heavy pull. When the trigger group is pulled from the firearm you will notice that friction/resistance is non existent, the extension rods and the trigger itself literally moves freely. After close examination of the trigger group I found 7 individual locations within the trigger group where plastic rubs against each other, thus creating friction/resistance. If these parts which come into contact with each other were made out of hardened steel, polished and properly lubricated, the friction/resistance would probably be cut to at least half .
There are several ways which I tough that it would help reduce this friction between these plastic parts. I've tried to disassemble the trigger group in order to try to seal & polish these parts that come in contact with each other but there is this locking pin which I haven't found a way to remove it and it prevents the complete trigger group from being disassemble. It almost seems that FN did this intentionally to avoid illegal conversions and/or help prevent voiding of warranties. Using a ultra slick grease between these friction points would help but you would need to make sure that this compound is safe on plastics. An individual came up with a simple solution to help fight the horrible pull, by simply adding a piece of thin, polished metal between one of the 7 contact points (the hammer & hammer release to be exact). Called the Neu Trigger it claims that this simple device will reduce your pull by a couple of pounds. I don't have a personal experience with this item but I'm expecting one to arrive soon and I guess I'll reply with a write up once tested. Other means by reducing the pull which makes perfect sense at first is to remove one of the two or cut back both of the hammer release springs but this is NOT RECOMMENDED. Unlike most trigger groups the FS2K has a set of 2 springs which are actually used as a trigger return and hammer release spring. By cutting/altering these springs you will reduce the trigger return tension but you will also handicap the hammer release tension which makes the weapon UNSAFE to the point were the hammer can drop un-expectedly.
I'm not an engineer nor I have the tools to be one but I truly think that there is room for someone to create an aftermarket trigger group out of hardened steel or possibly titanium (to keep the weight down) which can replace FN's OEM trigger group.
If any of you have successfully removed the previously mentioned locking pin, please post up or PM me.