[shade1]

ok so i finished my lower and i am now in the market for a upper and i stumbled across yhm uppers,, at cost vs value very affordable.I was wonder what you all thought of these uppers???

http://yankeehill.bizland.com/store/product370.html

[bwiese]

Who makes their barrels?
Are they chrome-lined? 4150 steel?

[impactco]

I have a YHM 14.5" carbine upper with pinned FH on a Spikes lower. Barrel description from their site:

"Made from chrome-moly vanadium steel , heat treated to RC 25-32, and chrome lined."

It has been 100% reliable and is very accurate. I have about 1k rounds through it so far. Shown here on the left:


Both rifles with 10 rd mags and BBs.

Love. Love. Love!
/swoon/
Ah, someone asked about these not too long ago, and ARBarrels ended up giving us quite a cool lesson about them.

Give the search tool a whirl.

[impactco]

That discussion is here:

http://www.calguns.net/calgunforum/s...ad.php?t=81342

....and yes....mine is a carbine length gas system. No issues so far.

[aplinker]

Carbines are harder on parts and will tend to have more issues. You're always better going with the longest gas system possible.

At 16" you're FAR better off with a mid-length gas barrel.

Mil-spec is a near meaningless term if they don't actually do the mil QC tests (HPT/MPI) on the bolt.

Almost everyone mislabels .223 chambers as 5.56. I would like to see what happens if someone ran Ned's 5.56 reamer through one of those.

Are there M4 feed ramps?

That YHM rail is pretty thick around and not very comfortable.

It also doesn't say what kind of barrel steel, which means it's not mil-spec 4150 mil-B-11595E. It's more likely it's a 4140 or a non-mil 4150. I think this is further down the list of what you want for an AR, but I'd prefer the higher spec'd steel.

Honestly, I don't see what that upper offers over, say, a BCM mid-length with a DD Omega at the same price.

I don't mean to be nit-picky, but for your $ I think you can get something that will serve you better.

[shade1]

ya i hear plaenty of great things about the bcm uppers the yhm looks kinda cool but im with you UCLA i think for cost comparison id be better off spending a tad more on a decked out bcm...im kinda bouncing around between the noveske n4 light recce 16, bcm , or just going with a stag 2h and just familiarize myself with the rifle im no newb when it comes to shooting just when it comes to ar's..

[impactco]

I sent an email to YHM sales as follows so we can get some definitive answers:

I have one of your complete uppers with the YHM-69-TF 14.5" barrel and would like to clarify some of it's specifications for a friend who is contemplating purchasing one:

Do you do mil QC tests (HPT/MPI) on the bolt?

Are these true 5.56 chambers or .223?

Who manufactures your barrels?

In regard to the steel used to make your barrels, are they made from mil-spec 4150 mil-B-11595E or 4140 or a non-mil 4150?

Do all your uppers have M4 feed ramps?

Thanks very much!

[impactco]

...and here's the answer from YHM. You guys were right. This is why they cost less.

Sir,
Thank you for your interest in our products. We do not do the mil QC tests (HPT/MPI) on the bolt. They are true
5.56 chambers. We buy our barrels as blanks from E.R. Shaw and finish them here on site. The steel used is 4140.
All our uppers have M4 feed ramps.





Thanks,
Tom Camilleri
Sales-Tech
YHM

[impactco]

An interesting link that provides an explanation of much of this:

http://m4carbine.net/showthread.php?t=6642

[sarki]

Think of it this way......Your not at war and your not pushing thousands and thousands of rounds through your AR. So if you like it, buy it. Its a good upper. I have the YHM 7200. Its great.

[impactco]

Originally Posted by sarki

Think of it this way......Your not at war and your not pushing thousands and thousands of rounds through your AR. So if you like it, buy it. Its a good upper. I have the YHM 7200. Its great.

Exactly! Mine has performed flawlessly as well.

That m4carbine.net link from Calguns user impactco discussed the importance of switching out the AR15 bolt carrier to an M16 bolt carrier.

What is the wisdom and legality of that replacement?

[Pvt. Cowboy]

I like mine a lot. I got the 11.5" barrel with a carbine gas system, as AR15Barrels pointed out in the linked thread here. I run a suppressor and have encountered no problems now that I know what to look for. YHM makes fine stuff at a good price.

[rabagley]

Originally Posted by workinwifdakids

That m4carbine.net link from Calguns user impactco discussed the importance of switching out the AR15 bolt carrier to an M16 bolt carrier.

What is the wisdom and legality of that replacement?

Based on my own personal understanding of the law, there is no legality problem as long as the resulting weapon can not fire more than one round per pull on the trigger. If you don't have a full-auto sear in your lower, you're fine.

As for the wisdom, if it's a better part with better heat treatment, better QC, or some other notable improvement, it's probably worth a little more money.

[aplinker]

You don't swap parts until they break or don't function properly, unless you're planning to be in a situation where a failure could cost you your life.