21/28 Run Problem
Posted 29 March 2004 - 11:20 AM
Posted 29 March 2004 - 11:36 AM
Are you using box magazines or a drum magazine? Maybe the feed lips are out of spec and are causing the forward movement of the bolt to lose inertia, thereby not feeding the round properly. In addition to replacing the firing pin and firing pin spring, you should also try a new recoil spring. These are sometimes the reasons for light primer hits.
Also make sure the oiler pads and bolt and blish lock are sufficiently lubricated.
Posted 29 March 2004 - 12:32 PM
I saw one that the oiler was bent and causing the pilot to cock to one side and bind the spring in the actuator. Good luck.
Posted 29 March 2004 - 12:37 PM
Your recoil spring could be too weak, try replacing it.
Posted 29 March 2004 - 01:45 PM
Posted 29 March 2004 - 02:53 PM
Posted 29 March 2004 - 03:09 PM
Posted 29 March 2004 - 06:45 PM
Inspect each round closely for any indentations.
Posted 29 March 2004 - 08:15 PM
Posted 29 March 2004 - 09:24 PM
There are a lot of good suggestions.
1 - check the ammo.
2 - push up on the mag. Even try to find someone locally who will let you borrow a mag they know works 100%.
3 - inspect each round for indentations
4 - Use a caliper to measure the lenght of the firing pin.
5 - Replace the internals BEFORE taking any power tools to the item. Worse case scenario is that you end up with spare parts that only get more expensive each year. I have replace a "new" part only to have the same problem, but replace it with a 2nd "new" part and have it work. Keep in mind there really are not too many "new" parts left.
6 - Listen and even video tape it. When you fire enough rounds you get good enough to tell when a round was going to jam by how it sounded as it cycled.
The ultimate thing would be to find someone close to swap out parts.
Good luck and keep us up to date on the progress.
Posted 30 March 2004 - 08:31 AM
Replace those expensive internals with a 2nd set before carving anything!
Or - if you get really tired of that thing - sell it to me!