CJS3 3 Posted October 11, 2010 Report Share Posted October 11, 2010 I recently did a FC mod on my 16 in. 308, and finally got it to the range today. The first 10 rounds were great. I adjusted the front sight (colored insert) and made sure the mag was functional. Then the problem started. The action wouldn't lock up after each shot. At first I just jammed it closed with the heel of my hand, but it got harder to do as I shot. This didn't happen with the factory FCG. When I changed out the hammer, I noticed it was a slightly different shape than the factory hammer. It had a slightly more pronounced striker side. This made it harder to install the bolt and carrier, and I noticed the bolt drags across the hammer when the rifle is cocked. I used a Tromix modified G2 trigger group. Does this group need further modification. It's no big deal to haul out the dremel and do the work. I'm just not sure that would fix the problem. Any input or past experience would be appreciated. Quote Link to post Share on other sites
nalioth 405 Posted October 11, 2010 Report Share Posted October 11, 2010 This is normal with any new FCG, including the originals. Shooting it will alleviate the issue. Quote Link to post Share on other sites
CJS3 3 Posted October 11, 2010 Author Report Share Posted October 11, 2010 That's what I thought when I did the installation. Do you think that would cause the problem I'm having? Quote Link to post Share on other sites
nalioth 405 Posted October 11, 2010 Report Share Posted October 11, 2010 That's what I thought when I did the installation. Do you think that would cause the problem I'm having? Anything is possible, but if it gets worse with each shot - and doesn't stay the same - that would seem to indicate other influences at work. The condition of "new FCG" I mentioned earlier gets better (to some small extent) with each shot, until the bolt carrier polishes it into shape. Quote Link to post Share on other sites
geepelton 105 Posted October 11, 2010 Report Share Posted October 11, 2010 I used a ram trigger guard on my conversion and I had to grind the nut under the trigger for it to work. Quote Link to post Share on other sites
TackDriver 1 Posted October 11, 2010 Report Share Posted October 11, 2010 Your function issue doesn't sound FCG related. The symptoms you described are the same I have when the chamber or locking lugs are not clean. Check, clean, and report back. Does it go into battery fine without a round in it? Quote Link to post Share on other sites
CJS3 3 Posted October 12, 2010 Author Report Share Posted October 12, 2010 Your function issue doesn't sound FCG related. The symptoms you described are the same I have when the chamber or locking lugs are not clean. Check, clean, and report back. Does it go into battery fine without a round in it? It does go into battery, but the bolt carrier visibly slows as it crosses over the hammer. She'll get a good scrubbin anyway, just cause I won't stick my fingers in it unless it's clean. Quote Link to post Share on other sites
paprotective 362 Posted October 12, 2010 Report Share Posted October 12, 2010 It will rub.. I took a fine dremel stone and just removed the finish from where it was rubbing.. Maybe remove the paint from the underside of the bolt area that runs over it.... Here is std G2 hammer and the factory hammer side-side. Yours does look more 'pronounced' then the G2 as shown here.. You could lay them side-side and see the differences.. and adjust accordingly using care.. or just let it break in.. Al Quote Link to post Share on other sites
paprotective 362 Posted October 12, 2010 Report Share Posted October 12, 2010 your area in YELLOW seems VERY angled and not flat.. the BLUE are should be FLATTER. Think you should compare them.. IMHO.. Others will chime in but to me its obvious.. maybe you got a CASTING defective G2.. Al Quote Link to post Share on other sites
paprotective 362 Posted October 12, 2010 Report Share Posted October 12, 2010 this is the std G2.. see the area in BLUE how its definately FLATTER.. Here is another side-side pic.. You can see its WAY different then that NEW hammer you have.. hmmm.. Quote Link to post Share on other sites
CJS3 3 Posted October 18, 2010 Author Report Share Posted October 18, 2010 (edited) Smoothed out the action on the new FCG I installed. Much improved carrier and trigger. Played with snap caps all week and finally got to the range today. After the first 5 rounds, same problem. This time I came better equiped. Had tools with me and started checking the componets as I fired. After spending the better part of an hour trying to fix a problem I really didn't understand, I had that awful "AW SHIT" moment where I realized what the problem was. I went to the range shop and bought two different brands of 308 ammo and came back to the line and loaded the magazines. Forty rounds later, without any malfunctions, I realized the ammo I had been using was the problem. I was using reloads that had pre sized and primered brass. I usually run (even new) reload brass through a sizer die, but on this batch I had gotten a "good deal" at a gun show, and used them as is. They work just fine in my bolt actions, but this was the first time I had used them in a "semi". I'll try reloading from scratch, but if the same problem reoccurs, I guess I'll just have to stock up on factory 308. Edited October 18, 2010 by CJS3 Quote Link to post Share on other sites
cw3sting 12 Posted October 18, 2010 Report Share Posted October 18, 2010 If you're going to reload for any semi, you will definitely need to do a full case resize. Man, I can't believe the gun show ammo deal. Sure a solid vote against reloads from unknown sources. Quote Link to post Share on other sites
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