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Page AR-15 » AR Piston Systems
AR Sponsor: bravocompany
Posted: 10/10/2010 5:32:31 PM EDT
Hello everyone,

I am relatively new to the AR platform and have a question about break in.  I put about 250 rounds down the "pipe" and noticed that there is some wear on the bolt carrier pads, the gas key and more pronounced wear on the receiver. I am just wondering if this is normal or if I should be concerned. The firearm is operating perfectly otherwise.  Here are some pics.  Your opinions would be appreciated.

http://members.cox.net/mjpetruzz/Model8breakinpic1.jpg
http://members.cox.net/mjpetruzz/model8breakinpic2.jpg
http://members.cox.net/mjpetruzz/model8breakinpic3.jpg
http://members.cox.net/mjpetruzz/model8breakinpic4.jpg
http://members.cox.net/mjpetruzz/model8breakinpic5.jpg
http://members.cox.net/mjpetruzz/model8breakinpic6.jpg

I assume this is normal and she is just wearing in  her parts " honing true" if you will but I have no experience with this design so I wanted to confirm it is normal. Otherwise she goes back to Stag for warranty.
Link Posted: 10/10/2010 6:20:23 PM EDT
[#1]
It a machine, it's normal.

Moving parts wear even if their running in gear lube, your ring and pinion will look worn (have shiny spots) in the differential of your car.

So, keep it lubed and run it hard! Don't look back until it stops.
Link Posted: 10/10/2010 6:36:13 PM EDT
[#2]
Cool , thats what I figured but I just wanted to make sure.

Thanks for the feed back
Link Posted: 10/10/2010 6:39:15 PM EDT
[#3]
It's going to wear a little here and a little there. Good shooting...
Link Posted: 10/10/2010 7:32:30 PM EDT
[#4]
As they say with breaking in new motorcycles and cars, "drive it like you stole it".

That amount of wear is normal break-in operations.
Link Posted: 10/11/2010 5:59:28 AM EDT
[#5]

Normal wear. Especially for a weapon running as dry as yours looks. These rifles run great on grease like other piston rifles. Buy some good firearms grease and lube up every area of the receiver and buffer assembly where a part moves against another.



Link Posted: 10/11/2010 5:19:36 PM EDT
[#6]
Thanks for the advice.  I have been using Rem Oil.  Can you recomend a good grease or perhaps mobile 1 synthetic?
Link Posted: 10/11/2010 7:39:25 PM EDT
[#7]
Synthetic ATF? I personally use tetra grease. A POF roller cam pin is an option too. I have used a standard cam pin for over 3,000 rounds on my 5.45x39 with osprey 416, and have less wear than that. I ordered a pof roller, just because I was ordering one for my 14.5 bcm, I just got, so I ordered 2. There is also a buffer at heavybuffers for piston systems to prevent tilt you could try. I have no experience with that either.
Link Posted: 10/11/2010 9:20:17 PM EDT
[#8]
Quoted:
Thanks for the advice.  I have been using Rem Oil.  Can you recomend a good grease or perhaps mobile 1 synthetic?


I use Tetra grease like Derrick above and have been for some time. I've tried Mobil 1, Militec, and various older style greases but still like Tetra more and use it in combination with Tetra oil for harder to reach places and wiping down parts. Some of your local gun shops should carry it, if not MidwayUSA.com or Brownells are good for online purchase.


Tetra products




Link Posted: 10/17/2010 8:28:23 AM EDT
[#9]
Thanks, I picked up some Tetra, the LWRC advanced cam pin and since I was on a spending spree , a BCM gunfighter CH even though it is unrelated-.  I look foward to hiting the 100 yard range to see if there is an improvement in the rate of wear to the receiver.
Link Posted: 10/17/2010 9:20:16 AM EDT
[#10]
Try Shooter's Choice grease, and definitely pick up a POF roller cam, and maybe even an AA bolt spring.
Link Posted: 10/18/2010 8:51:32 AM EDT
[#11]
I love this method of how a Di or Piston Ar is lubed ,


http://www.youtube.com/watch?v=OXIsKEHo-4g
Link Posted: 10/18/2010 9:11:26 AM EDT
[#12]
Quoted:
I love this method of how a Di or Piston Ar is lubed ,


http://www.youtube.com/watch?v=OXIsKEHo-4g



He does some of what I do, but I'm a bit more anal with application if I've got the time and lube the bearing surface of the inside receiver itself besides. I do believe it's better to lube the buffer assembly also to decrease friction so it's not dragging as much. Much more on a piston AR though with the different in rearward force (tilt) put onto the carrier and how it relates to the buffer tube. A good amount of grease for me too is put on the front bottom of the tube and rear skids of the carrier. A piston AR doesn't even get close to as dirty in the receiver and buffer assembly as a DI though. Neither does it bake on carbon and turn lube to paste with it so you can be less grease stingy.


Link Posted: 10/18/2010 10:09:14 AM EDT
[#13]
Quoted:
Quoted:
I love this method of how a Di or Piston Ar is lubed ,


http://www.youtube.com/watch?v=OXIsKEHo-4g



He does some of what I do, but I'm a bit more anal with application if I've got the time and lube the bearing surface of the inside receiver itself besides. I do believe it's better to lube the buffer assembly also to decrease friction so it's not dragging as much. Much more on a piston AR though with the different in rearward force (tilt) put onto the carrier and how it relates to the buffer tube. A good amount of grease for me too is put on the front bottom of the tube and rear skids of the carrier. A piston AR doesn't even get close to as dirty in the receiver and buffer assembly as a DI though. Neither does it bake on carbon and turn lube to paste with it so you can be less grease stingy.




I agree with all u said,Yes in fact the way he uses is more for a DI then a piston and i would like to add that i use some Grease on the piston rod were it slides in the reciever if u can have access to it and  on the cam pin .
Link Posted: 10/18/2010 10:44:38 AM EDT
[#14]
Quoted:
Quoted:
Quoted:
I love this method of how a Di or Piston Ar is lubed ,


http://www.youtube.com/watch?v=OXIsKEHo-4g



He does some of what I do, but I'm a bit more anal with application if I've got the time and lube the bearing surface of the inside receiver itself besides. I do believe it's better to lube the buffer assembly also to decrease friction so it's not dragging as much. Much more on a piston AR though with the different in rearward force (tilt) put onto the carrier and how it relates to the buffer tube. A good amount of grease for me too is put on the front bottom of the tube and rear skids of the carrier. A piston AR doesn't even get close to as dirty in the receiver and buffer assembly as a DI though. Neither does it bake on carbon and turn lube to paste with it so you can be less grease stingy.




I agree with all u said,Yes in fact the way he uses is more for a DI then a piston and i would like to add that i use some Grease on the piston rod were it slides in the reciever if u can have access to it and  on the cam pin .



Yep, me too. Forgot that. I didn't with my POF to a point anywhere it would get in the tube of the gas block to clog up the piston, but with Adams system I lube all the way to the cup because there's no way for it to get into the block while keeping the friction and wear down the rest of the op rod and springs.


Link Posted: 10/25/2010 5:22:22 AM EDT
[#15]
If you don't like the wear you can do like what a lot of people apparently do... don't use it... just trick it out and take pictures of it and keep it brand new looking forever. Put all the cool accessories on it and only take it out for dinner pics and to compliment other shit they're taking pictures of.
Link Posted: 10/30/2010 8:23:49 AM EDT
[#16]
Quoted:
If you don't like the wear you can do like what a lot of people apparently do... don't use it... just trick it out and take pictures of it and keep it brand new looking forever. Put all the cool accessories on it and only take it out for dinner pics and to compliment other shit they're taking pictures of.


Lol.....
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AR Sponsor: bravocompany
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