View Full Version : Cycling problems
March 25, 2008, 22:03
I have a friends STG-58 build with an Enterprise receiver... he asked me to fix it for him, it is having serious cycling problems, the gas system is closed all the way down with Max gas to the piston, and it still acts like it doesn't have enough gas, the spent cases just barely are ejected (sometimes not at all) It also has some sluggish feeding from the magazine, ie will not strip a round out of the magazine all the time, every time. I can't see how the lack of gas and the sticky feeding are connected... but may be separate problems, I could see the main spring being weak and not striping rounds but that would help the cycling of ejected cases, not hurt it.... It headspace's with a go gauge... The ammo is mal 85 ball and Port ball so it's standard 762 mm ball ammo. the gas plug is in the Auto position etc... The magazines are good have been run in different guns and I have changed mags w same probs... I'm running out of options, I'm going to switch gas pistons and see if that makes a difference then maybe Bolt carriers. I thought the tail may have been bent but it looks straight to me... Any idea's... B2B
March 25, 2008, 22:06
Somebody post the rail-smoothing mantra.
March 25, 2008, 22:11
March 26, 2008, 01:52
hmmm, that looks like an interesting idea.....I'll have to give that a try at the shop tomorrow.
March 26, 2008, 02:00
Sounds like some of the same probs I had with my Entreprise..clean it, open gas to around 5-5.5 and make sure you grease both sides of the bolt..not alot but enough to lube...then work the action alot--and if you decide to reload commercial brass get a small base sizer die from RCBS to eliminate any concerns over bulgy brass or headspace issues--I did all of the above and no problemos..and it has proven to be quite accurate as well
March 26, 2008, 04:47
Has anyone apart from Giilliiee tried the narrowing of the rails trick?
March 26, 2008, 17:25
I had all those problems with my enterprise receiver when I first built on it. The fix seemed to be open up to the gas port some and I had to extend the mag catch to make it feed reliably since the magcatch was almost .040 too low in the gun. I hope this helps and happy shooting.
March 26, 2008, 17:42
jesus did it to his fal ...
just kidding sig ....if you do it youll be about #389 ....who has ....with perfect results ...andy c and dead eye brunop can fill ya in ...
matt thought you started on that long ago ...talked at length to one of your guys there ....a month ago ..or more .heck even told him how to make a jig to do the ejector mod in shop .....(brass strikes /beaten up optics n rifles )be gone ...he where ya been ....he he ????
March 28, 2008, 01:29
I thought the gas system was designed to operate the rifle with excessive port pressure so as to run any and all different 7.62mm ammo, with plenty of extra gas to spare, I know my other L1A1 rifles with the gas closed all the way down will throw the brass many feet away, these are battle rifles... now enterprise receivers are not my first choice in building a FAl's. the castings seem to have many void or small flaws in the ones I've seen. I never thought the receiver would make a rifle not run. imbels would be my first choice in receivers. I have only one enterprise receiver in my personal gun builds an izzy HB but it runs great, now this problematic fal is a STG-58 and not my gun but I didn't think it will require a polishing job to get the gun to run... I can't believe that will solve the short stroke issue...I geuss if that is what it takes I'll give it a try... B2B
March 28, 2008, 10:58
bolt ....the rail wideing is only for the feeding problems ....
you stil have a gas problem with the short stroke ....or ...chamber .....what does a fresh round dropped in the chamber do when you press it in and try to move the base side to side ...if you have alot of travel there ...your barrel is toast ....ive gone thru (many) barrels .they start running real erratic when the chamber get sloppy .....kinda "steppy feelin" on ejection ???.......have a look and see.....
March 30, 2008, 00:19
Thanks for the info...guys the barrel is a Styer Hammer forged chrome lined barrel and it's not far from new. The other STG 58 I've build are usually really tight headspaced they require the smallest locking shoulder to work, but I tested this gun and it closes on the go gauge. I guess I just have to burn some more ammo and swap gas system parts out till she operates... I though the op rod might be bent and binding but it's straighter the a nun... I guess it could be a undersized piston head...or worn out tube.. dam I guess my work is cut out for me...I'll go ahead anopen up the receiver also can't hurt...B2B
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