When using my bad my bolt fails to lock back. So I have removed my Bad and now my gun runs correctly. However I want my bad to work so I am thinking about replacing my mag catch and spring associated with it. Does anyone know if this will work and if so where I can order just those parts instead of an entire parts kit?
My lower is a DD lower with DD parts.
Thanks.
What I think is this. Your weapon worked fine without it and then it didn’t when you added it. This would be called a “clue”. I don’t see how replacing perfectly good parts is going to make the problem go away.
You need to decide what is more important. Having the BCG lock to the rear when you fire that last round or having that “BAD” device on your weapon.
pretty strange, I have three BADs on a CMMG lower + G&R LPK, two DPMS lowers with delton LPK and a DPMS LPK, no problems here.
How tight is the bolt catch/release in that DD lower and LPK? Mine have slight play, its not tight tight but it appears to work for me. If the DD lower and LPK parts are tight fitting then it might be a goose chase trying to find out what bolt catch and spring works in it.
How do you know the parts are good? Maybe good enough for a new magazine to actuate it…what about an older mag? Maybe it’s got a little dirt in it which never helps…suddenly it’s not a good part any longer.
It could be a sign of a bolt catch that’s JUST barely working…
Because I have psychic abilities.
Weapon is probably failry new and low round count since it is a Daniel Defense.
Everything seemed to be working fine until he added the “BAD”. Read around a little and you will see that other people have had similar issues.
New or old mag wouldn’t really matter unless the hole was damaged. If there’s is dirt in there then that is operator error and it’s easily fixed with some air.
I’d consider an old magazine more of a “consumable” than a magazine catch. 
Round count on the lower is pretty low, but around 2500. I definately enjoy having my bolt lock back, thats why I removed it.
I guess my main question was have peolple inspected the parts to see why it works on some guns and not on others. Thats what I was interested in. But after another range trip today without it, I actually think I like my gun without the BAD device then with it.
Personally I think I would be better off spending the money on ammo or some back up parts.
Iraqgunz thanks for the advice, stay safe out there.