Yet Another M1S Upper Report

[cubflyer75]

Flewis, I would try another scope before writing off the barrel. I have a rem700 .223 20" bull that I was developing some loads for. At 100yds, with 100% match prep brass and 53gr SMK's, I would get 2 in the same hole, then point of impact would shift almost 1.5". Then another 2 shots in the same hole, then different POI. My scope was a BSA (read cheapo) and it was mounted rock solid. Changed scopes, and 5shot/1hole groups @100 yds. From looking at your group, I suspect that your scope mounting or internals(most likely) are moving. YMO. Mike

[JFettig]

I second that notion, get a decent scope. I had a bsa scope once on a .223 AR, I could never hit anything, changed scopes and my groups are sub MOA. Each time I took it out it would have a different zero.
The best cheap scope that I've found is a Tasco Target Varmint 2.5-10 mil-dot. I've been using one for 3 years, haven't touched the zero and have put over 1 thousand rounds through the gun. That and I remove it after every time I take it out(I have a 1 piece M1S mount).

Jon

[Flewis]

Well, I tried a different scope that I know is good and got the same results.

I also tried some faster loads, but didn't make it very far into the supersonic range. I'm going to try some hotter loads and also try some 208 gn Hornadys.

I think someone, somewhere, posted that their M1S upper came with a loose barrel nut... is there an easy way to check that? There isn't anything obviously loose on the upper.

[interceptor]

Originally Posted by Pitt300

Interceptor,
Did you get free float hand guards from M1S?

Nope. On this build I used a Hogue FF tube I had.

[Flewis]

Well, tried some super-sonic 220 SMKs and some sub-sonic 208 AMaxes with the same results... the target looks like a shotgun pattern. Just to make sure it wasn't me I ran 5 rounds through my .223 upper and all the shots overlapped.

I'm finished wasting ammo in this thing. I dropped it off at the gunsmiths this afternoon to let him go over it and see if he can find a problem.

I asked this before, but I think it got lost in the thread... anyone know where I can buy a good, match quality .300 Fireball barrel?

[snowhack]

Originally Posted by kdiver58

I mounted a scope with mil dots and lots of travel in the knobs. I was lobbing them out to 300 yards and had over 9 feet of drop :)
But I was able to hit a 12 by 12 plate at the distance..

BTW it's a Falcon Menace 10X

I fell in love w/ that scope just reading about it....saw it @ Sniper Central. How do you like it? Do you have the MP-5 reticle or Mil dot?

Sorry to side track. You can PM me so we can stay on track.

I have the M1S upper only w/ out the chromed bolt. Cycles like sand in your shorts. (it's pretty new yet) Will not cycle properly w/ H-110, Reloader #5 or #7. I was going to change up the gas port location and get an adjustable block, play w/ springs and buffers and more polishing of the bolt carrier. I'm going to try the AA powder first I guess. Especially since Bushmaster has a conversion kit for gas piston. (@ about $399.)


Wow sorry guys I replied to a post from the first page...should'a checked the lower right first.


Did you have the bore, grooves and lands checked w/ a scope? You may have had a lemony fresh barrel installed. My M1S upper is pretty consistant down range w/ all loads even being "pre-broken in". I inquired w/ M1S about the key hole forge marks out of curiosity and they told me of many diff forge houses supplying their cast parts. Not sure of the barrel man, but a lot of diff resources sometimes means a broad range in tolerence and fit. What about straightness and the crown? I know most times this goes w/ out mention for most here and I don't mean to insult intel, but you sometimes forget a thing or two.

[interceptor]

My barrel was recrowned at the same time as it was threaded for the Phantom adapter for the can, 11 deg.


<---- NOT a sastisfied M1S shopper...

[kurtz]

Originally Posted by Flewis

Well, tried some super-sonic 220 SMKs and some sub-sonic 208 AMaxes with the same results... the target looks like a shotgun pattern. Just to make sure it wasn't me I ran 5 rounds through my .223 upper and all the shots overlapped.

I'm finished wasting ammo in this thing. I dropped it off at the gunsmiths this afternoon to let him go over it and see if he can find a problem.

I asked this before, but I think it got lost in the thread... anyone know where I can buy a good, match quality .300 Fireball barrel?

last week this thread piqued my interest....I ordered everything to assemble a Model 1 300 Whisper 16" free float tube upper.....shot it Friday...after trying every make shoot trick I knew, the best I could get after around 200 rounds was about a 4" group at 100yds.....Broke it down today rechambered it in 7.62x40 thinking it might be a chamber issue and shot it today....similar results ......now that I have a base line I'm going to tear it down again and slug/check the bore and close off the port....shoot it as a single shot and hope start moving forward....

did toggle two different Mark 4 scopes between this upper and a 24" .223 upper, sighting in after moves.....the .223 would print finger nail sized groups at 100yds with either scope....the Model 1 would shoot about 1.5" at 25yds

I'll post what I find out...

Kurtz

[interceptor]

Say it with me now.... "MODEL 1 SUCKS".


Now, does anyone know of a source for GOOD 300 whisper barrels, and I'm guessing not SSK as I don't think they will sell just the barrel.

[kurtz]

Originally Posted by interceptor

Say it with me now.... "MODEL 1 SUCKS".

Laughing my ass off .....It is what it is, an inexpensive blaster.....my SSK AR will shoot sub-MOA with just about anything you stick in it, but it cost probably four times as much as the Model 1 stuff, but it works...thanks JD....

I haven't checked the Model 1 yet but just from running a jag and brush....it feels tight, tight, tight....or may be over sized and rough as hell....

ETA: I just remembered....I helped a friend from Texas put together a .223 Model 1 gun about a month ago....don't know if they do this to all of them but the chamber and bore was phosphate finished, or something black and rough....the chamber was so rough that it wouldn't cycle smooth with light reloads until we polished it out, but even at that it would shoot better than 4" at 100yds....