Tom will tell you that he is selling the CFW 9mm A-bolt as a 9x19 conversion for the SWD 380 M11A1 SMG with the large grip and a 9x19 (9mm) mags and barrel as that is the most reliable configuration.
I'm having good luck with the A-Bolt with and 9x17 (380acp) ammo. I have been using a RPB 380 SMG with a small grip and small metal mags.
Here is the data I recorded earlier in the year.
These ROF numbers tested with 1/4" neoprene buffer
Future testing with 1/8" urethane buffer generated about 25-50 fps slower RPM.
ROF - Rate of fire in rounds per minute
#RT – Number of rounds tested
Failure Codes:
LPS - Light primer strike, rounds enters chamber but bolt speed/force insufficient to detonate primer
MFS- Magazine feeding stoppage, rounds fail to feed up magazine before bolt closes due to drag from steel case or COAL in 380 magazine body
FTF – Failure to feed, rounds fail to enter chamber completely
FTE – Failure to eject, fired case caught between bolt and barrel
FTS – Failure to strip, bolt/recoil spring does have enough speed/force to strip rounds from a magazine loaded to 30. Federal Champion functioned with 28 rounds in magazine.
NA, Not available, unable to produce 10+ rounds of continuous fire to determine ROF
* Remington UMC was tested with 2 boxes from 2 lots. One box was significantly more reliable than the second. One box was significantly unreliable. The cases from one box were cosmetically blemished and splattered with dark oxidation.
If you want to run 9x19 (9mm) and 9x17 (.380) there needs to be two different length recoil springs.
65-63 coils on the recoil spring for .380.
90+ coils on the spring for 9mm.
*Using 65-63 coil recoil spring with 9mm ammo could cause damage to the lower receiver.
