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6/28/2026 1:09:02 AM EDT
After 300-400 Rounds?

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6/28/2026 9:10:38 AM EDT
[#1]
Have you contacted RB and asked them?
6/28/2026 12:20:16 PM EDT
[Last Edit: Aphex][Edited] [#2]
Its a known occurrence. Plenty of people have brought it up on various forums and social media but no one has commented that it got worse and started malfunctions.
6/28/2026 12:49:46 PM EDT
[Last Edit: Marksman14][Edited] [#3]
Bummer to see.  Keep us posted if they respond or it gets worse!
6/28/2026 1:14:28 PM EDT
[#4]
Forgive my ignorance, I don't own one. But judging by the pics, that is the hammer in question, correct? If so, what is that rough surface doing to the back and bottom of your carrier? I don't know about clone guns but HK hammers are very smooth/polished just as is the bottom of their carriers. What host are you running it in? Just curious...
6/28/2026 1:48:01 PM EDT
[#5]
Quote History
Originally Posted By Aphex:
Its a known occurrence. Plenty of people have brought it up on various forums and social media but no one has commented that it got worse and started malfunctions.
View Quote
They probably don't want to get sued.  




citizen vigilante in the making
6/28/2026 2:17:35 PM EDT
[#6]
Quote History
Originally Posted By chargerdude70:
Forgive my ignorance, I don't own one. But judging by the pics, that is the hammer in question, correct? If so, what is that rough surface doing to the back and bottom of your carrier? I don't know about clone guns but HK hammers are very smooth/polished just as is the bottom of their carriers. What host are you running it in? Just curious...
View Quote


The carrier and firing pin is what is beating up the hammer. If I was a betting man I'd wager money that a softer hardness was chosen purposely for the hammer by Rarebreed as sacrificial material much like how AK FCG are set up.
6/29/2026 12:15:46 AM EDT
[#7]
Known to happen. No known instances of hammer breaking.
6/29/2026 12:29:16 AM EDT
[#8]
OP should be banned for supporting rare greed
6/29/2026 7:21:58 AM EDT
[Last Edit: Aphex][Edited] [#9]
nvm
6/29/2026 12:05:07 PM EDT
[#10]
Quote History
Originally Posted By ChemTrailZ:
OP should be banned for supporting rare greed
View Quote


I hate that I have to say this, but if you want to bash Rare Breed go do it in GD. This is a tech forum.
TEAM GIMMICK FOREVER
6/29/2026 12:50:22 PM EDT
[#11]
OP, my MKE factory hammer in my AP53 has some marks and dings in it as well. I'm not sure if that's normal wear for your particular trigger, but it's my understanding that the hammers do wear over time.
TEAM GIMMICK FOREVER
6/29/2026 1:51:54 PM EDT
[Last Edit: Aphex][Edited] [#12]
I took some pics of my RB FRT-RD3 (Ambi) hammer. I have roughly 300 rounds of 158gr subsonic fired with it on a suppressed full size MP5 clone using a 100 degree locking piece.

6/30/2026 12:06:26 AM EDT
[#13]
Quote History
Originally Posted By ChemTrailZ:
OP should be banned for supporting rare greed
View Quote


Unfortunately they have the best MP5 FRT right now.
6/30/2026 11:47:34 AM EDT
[#14]
One thing we should ask is what brand of gun is this trigger in?

Interested in the locking piece.

It's well known that AP5s use a 110° or 120° piece. HK uses 100°

So do these locking pieces affect bolt velocity?

Bolt velocity is something to consider.
7/1/2026 11:30:33 AM EDT
[Last Edit: lil_Sig][Edited] [#15]
AP5. The cycling rate sounds about right by my ears.

An app to calculate rate of fire would be nice.
7/13/2026 11:00:11 AM EDT
[Last Edit: chase45][Edited] [#16]
I maybe have 300 to 400 between a few different guns

Mp5k and mp5sd mostly. All suppressed. 80 degree piece in the k and a 115 in the sd

Seems like my SD has a slightly higher rof than the k but that maybe due to my 147gr reloads vs 124 factory

I do lube my hammer, ejector and disco or trip or whatever they are calling them in these. Feel like I remember the instructions saying not to lube which I found odd

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Battle Of West Appalachia Survivor
7/20/2026 4:25:55 PM EDT
[#17]
Quote History
Originally Posted By AbstractIdeas:
One thing we should ask is what brand of gun is this trigger in?

Interested in the locking piece.

It's well known that AP5s use a 110° or 120° piece. HK uses 100°

So do these locking pieces affect bolt velocity?

Bolt velocity is something to consider.
View Quote

So is a new locking piece the solution to this problem?

Only shot 30 so far and I'm seeing signs already. Kinda sad.
7/22/2026 11:03:58 AM EDT
[#18]
Quote History
Originally Posted By CPT_CAVEMAN:

So is a new locking piece the solution to this problem?

Only shot 30 so far and I'm seeing signs already. Kinda sad.
View Quote


What is yours in?

What does the back of the carrier look like?
Battle Of West Appalachia Survivor
7/22/2026 7:18:50 PM EDT
[#19]
Quote History
Originally Posted By chase45:


What is yours in?

What does the back of the carrier look like?
View Quote

It's in a full size AP5.

Can't post pics, but it looks OK.
7/22/2026 9:58:39 PM EDT
[#20]
I will check mine soon and post a pic. I have the RB in a SP5K PDW. appx 600 ish mixed rounds of 115, 124, 147.
7/23/2026 1:20:00 AM EDT
[#21]
I’m seeing this on mine after about 500 rounds. Hasn’t gotten any worse, I’m not too worried.

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