HKPRO Forums banner
1 - 15 of 15 Posts

·
Registered
Joined
·
25 Posts
Discussion Starter · #1 ·
Just received tracking info for my new Z-5RS, should be here middle of next week.

What should I be inspecting, or paying close attention to on the firearm before I sign off on it?
Thanks
 

·
Registered
Joined
·
2,924 Posts
Before signing, the main things to look for would be shipping damage. Other than that, as said above. A break in with 124gr is always a good recipe.
Enjoy it. They are great.
 

·
Registered
Joined
·
771 Posts
Definitely check to see if rear and front sights are canted. Check magazines to make sure each locks securely into place. Cycle weapon to make sure that trigger group is properly working.
 

·
Registered
Joined
·
3,277 Posts
Before signing, the main things to look for would be shipping damage. Other than that, as said above. A break in with 124gr is always a good recipe.
Enjoy it. They are great.
You know this is an important point. If you are going to be all OCD about some blemish on your new gun - save yourself some grief and flaming by not accepting the transfer in the first place. It is and always has been an option.

This is a general statement and not necessarily aimed at the OP :wink:
 

·
Registered
Joined
·
25 Posts
Discussion Starter · #7 ·
Thank for the reply, I can see from looking at photos the rear sights should be canted, should the front sights be slightly canted toward the rear?
Definitely check to see if rear and front sights are canted. Check magazines to make sure each locks securely into place. Cycle weapon to make sure that trigger group is properly working.
 

·
Registered
Joined
·
274 Posts
left and right cant is what you should check. yes, the rear drum is canted forward by design and the front sight hood is cut to look as if it might be leaning back. Just make sure it zeros OK.

DS
 

·
Registered
Joined
·
25 Posts
Discussion Starter · #10 ·
Just a quick question, what is the benefit of using 124gr ammo on a new 5RS?
I appreciate it thank you.
Before signing, the main things to look for would be shipping damage. Other than that, as said above. A break in with 124gr is always a good recipe.
Enjoy it. They are great.
 

·
Registered
Joined
·
2,924 Posts
Just a quick question, what is the benefit of using 124gr ammo on a new 5RS?
I appreciate it thank you.
As Fun mentioned, 124gr NATO is hotter. That helps in any new, combat grade weapon from HKs through MP5s. New arms of this grade have heavier recoil spring assemblies that out of the box may be a bit stiffer along with the very tight tolerances of bolts, etc. Running the NATO spec munitions that the arm is designed for helps for a quicker break in. Sort of like when you child demands their special cereal in the morning. It is best to feed them it and make them happy and thus a win/win. Otherwise, for us parents, we all know what the morning starts out like when that favorite box is empty and we try and feed an alternative.
When I unboxed my ZRS, I put a few hundred rounds of 124 through it and then ran 115 and had no issues at all. Might it have been the same had I just run 115 from the start? Possibly. However I have always made it a practice to start with the round that the arms were designed to handle and that practice has made for an error free start of any new arm I have acquired.
Personally I run MEN15 (9B) now for starting any new HK or MP5. I have found that some 124gr is not truly NATO and if I recall correctly, the difference is a couple hundred ft pounds, which is significant. Some of the 124gr out there is exiting the barrel at the same speeds as 115gr which is no help. NATO rounds are about 2,000 to 2500 PSI more than standard 124gr. If you look at charts, 124gr from various manufacturers has speeds and pressures all over the place. Roughly said, NATO is more in line with a +P load.
It is not the grain weight of the projectile that helps but rather the pressures of the 124gr NATO round, that help break in stiffer springs.
 

·
Registered
Joined
·
25 Posts
Discussion Starter · #13 ·
Thanks for the reply, I went through my ammo locker and found some boxes of Geco 9mm 124gr (red box) the muzzle velocity is 1181 fps and the muzzle energy is 382 ft-lbs. I'll look around town see if I can find something with a higher velocity.
As Fun mentioned, 124gr NATO is hotter. That helps in any new, combat grade weapon from HKs through MP5s. New arms of this grade have heavier recoil spring assemblies that out of the box may be a bit stiffer along with the very tight tolerances of bolts, etc. Running the NATO spec munitions that the arm is designed for helps for a quicker break in. Sort of like when you child demands their special cereal in the morning. It is best to feed them it and make them happy and thus a win/win. Otherwise, for us parents, we all know what the morning starts out like when that favorite box is empty and we try and feed an alternative.
When I unboxed my ZRS, I put a few hundred rounds of 124 through it and then ran 115 and had no issues at all. Might it have been the same had I just run 115 from the start? Possibly. However I have always made it a practice to start with the round that the arms were designed to handle and that practice has made for an error free start of any new arm I have acquired.
Personally I run MEN15 (9B) now for starting any new HK or MP5. I have found that some 124gr is not truly NATO and if I recall correctly, the difference is a couple hundred ft pounds, which is significant. Some of the 124gr out there is exiting the barrel at the same speeds as 115gr which is no help. NATO rounds are about 2,000 to 2500 PSI more than standard 124gr. If you look at charts, 124gr from various manufacturers has speeds and pressures all over the place. Roughly said, NATO is more in line with a +P load.
It is not the grain weight of the projectile that helps but rather the pressures of the 124gr NATO round, that help break in stiffer springs.
 

·
Registered
Joined
·
2,924 Posts
Thanks for the reply, I went through my ammo locker and found some boxes of Geco 9mm 124gr (red box) the muzzle velocity is 1181 fps and the muzzle energy is 382 ft-lbs. I'll look around town see if I can find something with a higher velocity.
That's still a bit hotter than others and should handle the task.
 

·
Registered
Joined
·
771 Posts
Just a quick question, what is the benefit of using 124gr ammo on a new 5RS?
I appreciate it thank you.
The more powerful ammo will result in faster break-in. The gun may not function well out of the box if you are using underpowered 115 grain ammo like Winchester White Box (mine did, but others have had issues). If you break it in using 124 grain ammo for about 300 rounds, you should be good to go.
 
1 - 15 of 15 Posts
Top