Short stroking.

 

C

You can test the bolt and barrel extension interface pretty easily. Stand the upper on the muzzle and pull back on the charging handle. Holding the carrier, lock the charging handle to the upper and pull the carrier back as far as you can without unlocking the charging handle (basically where the rear of the key contacts the charging handle). Let go of the carrier and check to see if the bolt goes completely into battery. I've seen a handful (three or four) of our house branded bolts not play well with some barrel extensions because the extensions are tight (in-spec but on the low end of tolerance) while the bolt is on the higher end of tolerance which causes additional energy to be needed to unlock the bolt due to increased friction and can mimic short stroking. Having no experience with Satern, I think this is worth a look.

I know it sounds stupid, but did you lube it up real well? Also what buffer are you running?

Ty, all seems like it works as it should. Thank you for the heads up.

 

PB, I took everything apart and did just that. I'll go shoot it again ASAP.

 

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I'm betting it's ammo related --  

 

When I built my 1st AR I also loaded my 1st .223 -- not knowing enough about the platform, and also wanting to start low with a new load I didn't generate enough gas to cycle the action

 

Luckily I had 1 box of factory stuff -- The gun was just fine

 

If I didn't have that factory ammo I would have been crazy chasing a problem that didn't exist

 

Topher,  What's your recipe in your ammo -- Although I know nothing about 300 black did you "start low" like you are supposed to when working up a load?  

Relatively low. I am gonna work some up a bit hotter and see what happens. The gun is definitely tight so that combine with a lighter charge could definitely be the problem. I'm certain to get it worked out. Just might take a minute

 

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Tropher are you shooting supers or subs???? That's what I was inquiring about they say you would have issues shooting subs out of a 14.5 barrel with a carbine gas setup. From what I read on the 300blk talk site you might have to open up your gas port a bit.... please don't take me as a know it all Iam far from it. I still trying to put mine together so your ahead of me lol..... good luck brother let us know how you make out.....

Everything I loaded is super. I only have the sub's cuz I have the subs.

 

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Got ya... just trying to help out.....

Got ya... just trying to help out.....

Much appreciated sir.

 

C

Topher, I just dropped off my 300BLK build with Rick to pin the brake on. He mentioned your build and I told him I saw pics here.

 

I have a larger order of reman supersonic stuff coming in (as well as some subs). If you want, I can drop off some with Rick and you can grab them from him if you are looking for some supersonic loads.

So, I loaded some hotter 147gn ammo up this morning.  Same issue.  The bolt is cycling most of it out, but not picking up the round from the mag.  I'm thinking that a lighter weight spring should do it. 

 

Gun is pretty accurate at 25 yards.  More accurate than I am, for sure.  Now I just gotta get her to run as more than a single shot.

 

C

 

Edit: I ordered a reduced power spring from Wolff. As soon as it gets here I will throw it in the rifle and try that. Additionally, how difficult should it be to get the bolt to come out of battery? When I have the rifle pointed muzzle down and tug on the bolt with my hand, that first little bit is definitely sticky. Not grunt or hand hurting sticky, but sticky. And a little rough. I assume that's the lock for when the round goes off and heads down the barrel, but I figured I'd ask.

shouldn't be sticky at all -- did that satern barrel come with a matched bolt?

 

may be an issue with the lockup between bolt and barrel --

 

if it where me I'd still want to try a few factory rounds...

shouldn't be sticky at all -- did that satern barrel come with a matched bolt?

 

may be an issue with the lockup between bolt and barrel --

 

if it where me I'd still want to try a few factory rounds...

Hey Jer.

 

It's not the bolt/barrel interface. It's the bolt/carrier. It's almost like the cam pin or the rings are a bit too tight. The bolt/barrel extension is nice and smooth.

 

C

So, I loaded some hotter 147gn ammo up this morning.  Same issue.  The bolt is cycling most of it out, but not picking up the round from the mag.  I'm thinking that a lighter weight spring should do it. 

 

Gun is pretty accurate at 25 yards.  More accurate than I am, for sure.  Now I just gotta get her to run as more than a single shot.

 

C

 

Edit: I ordered a reduced power spring from Wolff. As soon as it gets here I will throw it in the rifle and try that. Additionally, how difficult should it be to get the bolt to come out of battery? When I have the rifle pointed muzzle down and tug on the bolt with my hand, that first little bit is definitely sticky. Not grunt or hand hurting sticky, but sticky. And a little rough. I assume that's the lock for when the round goes off and heads down the barrel, but I figured I'd ask.

With use, the bolt lugs will wear into the extension and they'll come apart with less effort.

 

Test the bolt in the carrier by pulling the BCG out then push the bolt into the carrier. Grabbing the carrier by the rear, give it a flick of the wrist to see if the bolt will extend. If not, the bore may be a little tight.

I had to track down my notes (and finally did) but I remembered I ran into something similar with a 10.5" SBR build. The gun felt like it cycled properly and was back into battery completely but didn't pick up the next round. I went from a carbine weight to an H2 buffer and it ran like a top.

So, the gun runs!!

 

I took a look on 300blk forum and discovered that the 300 needs more gas to run well. So, I opened up the gas port just a touch. I also made double-triple sure that everything was clear and that it lined up.

 

In looking over the BCG I noticed that the cotter pin that holds the firing pin in was spread. That would be my fault as I took it apart and during reassembly tapped the cotter pin in with a small hammer thinking that it was too tight and didn't fit. Anyway, the pin spread enough to capture the firing pin and restrict movement of the cam pin and bolt. Once I realized my mistake, I fixed it and I now have a functioning gun.

 

Yay me!!

 

C

Good news.

How much did you have to bore out the gas port. In case I have to do mine.... .125 ???

114

 

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Good to hear

Thanks that will give me a starting spot. Iam waiting on the barrel so I will mic it when it arrives. What did you start at?

I don't remember what it was. I went 114 as that is the largest bit I had without going WAYYYYY over sized.

 

C

Got ya bro thanks... keep us updated on your range trips...

So, I got a smart phone which is what I've been answering some of these posts from. Although it's neat it's clunky with the touch pad keyboard. That's why some of the answers have been a touch short. I apologize for that.

 

So, my thoughts on the rifle and especially some of the areas of concern that I've been asked about...

 

The barrel: It's really nice. The M4 profile, while I think it's horrific looking keeps it nice and light. Even with the muzzle brake that's on there which is heavy, the overall rifle is quite handy. At 25 yards, once I got the scope dialed in the gun ate the center of the target. So, for a quicky assessment on accuracy, it's accurate. I didn't build this gun for groups so taking out a 4" target at 25 with 50 rounds is perfect for me. The minor tweaking I had to do on it was, for me, just another part of the build process.

 

The forearm/rail: The Seekins SP3R rail is probably the best investment that I made for this rifle. It is pretty light, EXTREMELY comfortable, and off any kind of rest, very stable. The wide, flat bottom has both the perfect feel in hand and the ability to go on a tree or wall and stay still. I really like it.

 

The BCG: Ty makes an amazing product. Some of it I need to take his word on (like the longevity rating of the various steels) but the gun runs awesome now that I figgered out what I did wrong. His initial BCG was awesome out of the box. On a side note, Ty's service is great and his recommendations are perfect. I recommend MidwestPX very highly.

 

The linear compensator/brake: I like it. I don't know how much "brake" it gives however the gun "pushes" a bit without a ton of rise. It does seem to throw most of the sound downrange making things pretty pleasant for those around me, and me. I really dig the look as well.

 

The build process: A f%(k-ton of fun!!! I already have another lower and am starting to plan that one. Unfortunately planning is all I can do as I'm broke. However, I really like the process.

 

Thanks to any and all that have followed along and contributed to either of my threads. If anyone has any questions, feel free to post or PM and I'll do the best I can to help.

 

C

How are you liking the Skeleton stock? Im thinking about picking one up eventually.

I absolutely love it. Super light and comfortable. Fits me very well.

 

Overall I am very happy with the rifle. Only exception being that I haven't had all that much time to shoot it.

 

C

Standard size? I was thinking about the smaller one.

Yes. Rifle length. If you're in the Bergen Cty area, feel free to drop me a line. You are welcome to swing by and handle it.

 

C

Standard size? I was thinking about the smaller one.

Small one is ideal for someone with body armor and a chest rig... Pretty short without... Also depends on shooting style...

My first AR when I lived in NJ had the short one

I agree. I have the ace and its a bit short.