I bought a brand new direct from SMOS Arms complete upper that I took out today and it was a damn nightmare. I am not sure what the issue is actually. it is a complete upper with a new BCG. I put it on one of my lowers that has a Geiselle Super 42 buffer and braided spring in it. These are on most of my AR rifles and all work great with them. So, I also tried three different factory Magpul new mags and was using all great ammo. I tried black Hills, Federal, Hornady and copper creek and each type and mag combo all has the same issues.
It shoots and ejects fine but it ejects at about 5 o'clock. it pick up the next round but it jams in the top of the receiver or they take a nose dive and jam into the feed ramps. Like I said I thought at first mag issue but no go on other mags. It is accurate what I can get it to shoot 5 rds in a row. In one hr the damn thing malfunctioned at least 10 times. And it almost never locked back on the last round.
Any suggestions? it is not an adjustable gas block and is a 14.5 mid-length gas system Shilen barrel. I was going to change the buffer maybe to a light weight buffer?? I cannot try much because the muzzle is pinned and welded, so it is buffer and BCG I am hoping to fix it. I contacted SMOS Arms and will see what they say but I wanted to see if it is fix or not. I appreciate it!
Update- I swapped the Geiselle system for a stand. weight buffer and spring and it functioned 100% today and locked back every last rd. fired. The ejection pattern is also normal- right at 3-4 position. What is weird it took about 10 rds before it started to eject to the right point. The first 10 rds fired ejected very far back still almost to the 6 o'clock. But I tried prob. 100 rds today and it shot great. Many 1 rd shots to see if it locked back every time and it did.
What I do like is it shoots everything pretty well. Maybe the most consistent gun I have seen. No matter what ammo I shot (except Bl Hills) it was right around 1- 1 1/4" groups. even cheap ass American Eagle 55 gr. shot that and the Fronteir 55 grn. shot right at 1"! Black Hills 77 grn. 5.56 shot a .6" 5 round group also. It did not group better then around 1" though with anything but the Bl. Hills. I shot, Horn. 75 T2, two types of 77 smk Creemoore ammo, IMI 77 gr, Fronteir 75, and 62 and 68 all macth, but all the same- 1"
I am not complaining at all at least it shot 1" with cheap ammo and really likes the Black Hills 77 smk! It is smooth shooting. Oh, and SMOS arms did get back to me on Friday and was helpful. So, they are not bad either. In all, I am very happy that all it is was a buffer swap and it shoots sub moa groups with almost anything I fed it!
It shoots and ejects fine but it ejects at about 5 o'clock. it pick up the next round but it jams in the top of the receiver or they take a nose dive and jam into the feed ramps. Like I said I thought at first mag issue but no go on other mags. It is accurate what I can get it to shoot 5 rds in a row. In one hr the damn thing malfunctioned at least 10 times. And it almost never locked back on the last round.
Any suggestions? it is not an adjustable gas block and is a 14.5 mid-length gas system Shilen barrel. I was going to change the buffer maybe to a light weight buffer?? I cannot try much because the muzzle is pinned and welded, so it is buffer and BCG I am hoping to fix it. I contacted SMOS Arms and will see what they say but I wanted to see if it is fix or not. I appreciate it!
Update- I swapped the Geiselle system for a stand. weight buffer and spring and it functioned 100% today and locked back every last rd. fired. The ejection pattern is also normal- right at 3-4 position. What is weird it took about 10 rds before it started to eject to the right point. The first 10 rds fired ejected very far back still almost to the 6 o'clock. But I tried prob. 100 rds today and it shot great. Many 1 rd shots to see if it locked back every time and it did.
What I do like is it shoots everything pretty well. Maybe the most consistent gun I have seen. No matter what ammo I shot (except Bl Hills) it was right around 1- 1 1/4" groups. even cheap ass American Eagle 55 gr. shot that and the Fronteir 55 grn. shot right at 1"! Black Hills 77 grn. 5.56 shot a .6" 5 round group also. It did not group better then around 1" though with anything but the Bl. Hills. I shot, Horn. 75 T2, two types of 77 smk Creemoore ammo, IMI 77 gr, Fronteir 75, and 62 and 68 all macth, but all the same- 1"
I am not complaining at all at least it shot 1" with cheap ammo and really likes the Black Hills 77 smk! It is smooth shooting. Oh, and SMOS arms did get back to me on Friday and was helpful. So, they are not bad either. In all, I am very happy that all it is was a buffer swap and it shoots sub moa groups with almost anything I fed it!
Last edited:
