Have a small bolt bounce issue and need to slow things down a bit.
1200 rpm is just a little too fast
Where you get 1200 from ar15/M16 ? L7A1 and 2.9oz CAR buffer in a CAR stock ?
These buffer is available from Ken Elmore @ Specialized Armament Sales, scroll down to the buffers
ISMI carbine spring & an H buffer (3.8 oz)...
Just tap the trigger and 10 rnds are down range. Kinda like buckshot
Thx for the link.
Here's a quick vid of a 9mm AR15 using a standard AR15 carbine buffer spring and an "H" Buffer (3.80 oz). Chrono average was just under 850 Rounds Per Minute.
This is what happens when you use a 5.56mm H-buffer in a 9mm rifle:
H Buffer Bolt Bounce Failure
Those water jugs had a chance after all
A little update on my buffer/spring experiment since someone kicked it back up to the top...
A friend and myself were trying different buffer/spring combos to see how high we could get the ROF (Rate Of Fire) from a 9mm rifle. I once fired a Glock 18 and thought it might be fun to replicate something that had a similar ROF (around 1200 rpm).
During our experiment, we found that:
1. Using an ISMI buffer spring w/ standard 3.0 OZ (.223) carbine buffer had the highest rate of fire with a ROF of 1177 rpm (average w/ five BB failures).
2. Still using the ISMI buffer spring and an "H" 3.8OZ (.223) carbine buffer the ROF declined to 1058 rpm (average w/ two BB failures).
3. Still using the ISMI bufffer spring and a RRA buffer 5.6 OZ (9mm) carbine buffer the ROF declined dramatically to 723 rpm (average w/ no BB failures).
1. Using an standard CAR buffer spring w/ standard 3.0 OZ (.223) carbine buffer had the highest rate of fire with an avrage ROF of 967 rpm (average w/ one BB failure).
2. Still using the standard CAR buffer spring and an "H" buffer 3.8OZ (.223) carbine buffer the ROF declined to 863 rpm (average w/ one BB failure).
3. Still using the standard CAR buffer spring and a RRA buffer 5.6 OZ (9mm) carbine buffer the ROF declined to 610 rpm (average w/ no BB failures).
Only the RRA 9mm buffer fired five (20 round) strings with no boult bounce issues.
My unqualified opinion is to utilize an ISMI buffer spring and a RRA 9mm for the most dependable, lowest cost and highest ROF option.
Next month.... The "how slow can we go" experiment.