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SDM by Rainier

GillJr

Sergeant
Full Member
Minuteman
Dec 11, 2009
244
1
38
NC
I have been firing a Remy 700 .308 for a while. I really like the rifle, but the semi-auto bug bite me. First I purchased a milled AK from Centurion Arms. In the end I wasn’t completely happy with the AK’s performs, so I took one more bite and ordered an AR15 from Rainier Arms. I called Rainier Arms the July 10 ordering parts to start the build they would do for me. They had most items in except for the upper receiver; I was going to go with their milled upper. They said they did not know when the upper would come in, so I decided to give them a couple weeks. After talking to another polite gentleman he suggested looking at Mega Upper. I then saw the side charging upper. I thought it was a cool idea and would prefer side charging with the scope of top. So now I am on a mission to find Mega Arms side charging upper which is not really Mega’s per say. A company apparently makes them for a few dealers like Alexander and a third that slips my mind. After lots of calling around no one had any in stock or know when the upper would be back in stock. Mega gave me a wait of months. Then BLDTYLRY made a suggestion of Quentin Defense. Their uppers are 6061 not the more desired 7075. They mailed the upper for me directly to Rainier after some kind of week delay (USPS). But I found out it has lost some where a week after I called Rainier and they said they had received it. Calling Rainier was hit or miss. Some of the guys were great to talk to and helped a lot; then others were too busy to help the customers or even check if they had a part or make sure they get the right part for me. I ended up with an olive PRS stock instead of the black I had requested, but it matches the scope thankfully. Another delay of a week was because of my FFL (Bryant’s Gun and Pawn apparently don’t like transferring AR Lowers but the employees didn’t know) not sending their license which never happened and I have change gun shops. The lower finally got here September the 11.

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Re: SDM Rainier

No for how she shoots. I zeroed her in with some Prvi Partizan(69 and 75 gr.) which it did shoot so well. I was able to find some 75gr Tap locally which it did like but didn’t shoot for groups. So total rounds fired was roughly 50. Yesterday I went out with some Black Hills remanu. 69 and 77gr. she liked! The black in the center is 1in. I pulled a couple of shots but she still did well. But the groups really opened up at 200 yards. Sure it was more me then the rifle.

Rainier made another shooter. Quentin Defense SC upper, Seekins lower, Rainier SDM barrel, Rainier the rest.

100 69 gr
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100 77 gr
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200 69 gr
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200 77 gr
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200 yards 77
 
Re: SDM Rainier

The only item I am a little disappointed in is the National Match Bolt Carrier by Young Manufacturing. It is purely cosmetic but when you pay $265 for a BCG you would prefer not to have tool marks.

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Re: SDM Rainier

I decided to give Froglube a shot since this was a new rifle. Is anyone using purely Froglube on their rifle? How about the barrel?
 
Re: SDM Rainier

Cool stick. Can you still charge the weapon with the normal charger?

I've often wondered why I never see left side charging uppers.

To me it seems as if charging with the support hand would follow the same manual of arms as charging using the normal charger with the left hand only.
 
Re: SDM Rainier

It still can be charged from the rear. Their are a couple of left charging uppers but very few.
 
Re: SDM Rainier

Quentin is a local shop to me, and they make excellent products. Their uppers used to come from Sun Devil Mfg, but last time I was in there I believe Jason said they were doing them in house now. I beleive they also make lowers for Scott at Specialized Dynamics.

Taken from a posting on Barf.com. (I can vouch for what Sun Devil says here as they are local as well and attend a lot of the same club matches I shoot.)

Here is Sun Devil's response to the 6061 vs 7075 and billet vs forged issue:

"well guys, thought maybe we should respond to this one. some of you are stating that the 6061 alloy is inferior to the 7075, and that this is a big issue for you. there are several types of 6061 aluminum. we use 6061-T651. its the strongest of the 6061 and actually has a greater elongation than any 7075 of the same thickness. what does that mean? it means the material will have some give to it before it snaps, meaning less brittle. 6061-t651 has a elongation of 10% where as 7075 only has an elongation anywhere between 3-10% on the same thickness of material. it also has a tensile strength of 42,00 psi. there are several types of 7075 that have that same tensile strength. do you know what type of 7075 your lower is? are you sure your lower is made with the strongest 7075 available? i can tell you its not because the price you would pay would be substancually higher for your lower.

we here at Sun Devil Mfg do use the 6061 for several reasons. conturary to what has been posted, its actually a lot more corrosion resistance than 7075. it also holds an anodize better than 7075. we hard anodize are lowers making the anodize thicker. 6061 is cheaper and its easier to machine. we dont use forged molds like all other lowers. some people are claiming that a forged lower is stronger than our billet lower. what happens when something is forged. 2 parts are pressed together at extreme pressure which causes the molicules to align, creating a stronger product than say a cast part. now how do we get our blocks of aluminum? they're not from a cast block thats for sure. when we buy a bar of stock aluminum, say 12 ft long, we get it in our desired dimensions. how do the metal companies get those dimensions? they press the metal to the desired size, just like a forge. all the strength of a forged product is there. now that we have a forged brick 8" in length we can start our machining process. this means we dont have to rely on the 3 or so main companies that supply all the other lower manufactures w/ their molds. "
 
Re: SDM Rainier

BigB&G the Quentin sc upper is very nice and it matches with my Seekins lower nicely.

Does anyone have a opinion on my Young NM bcg?
 
Re: SDM Rainier

I don't have much experience with bolt carriers but I can say that my RRA chrome carrier has a much better internal finish.

I also noticed that my carrier has a narrower firing pin channel in that area.
 
Re: SDM Rainier

Update on the bolt carrier. Young Manufacturing told me to send the NM BCG to them to inspect. After stating how much I bought the BCG for and it has tooling marks is a little ridiculous. The lady then stated they would replace the BCG. We will see I just hope I am not going to be out a BCG for months.....
 
Re: SDM Rainier

How did you contact them? I just got one of those carriers with the same severe tool marks.
 
Re: SDM Rainier

Congrats man, what a shooter. Love the guys at Rainier. Knowledgable and fast shipping.
 
Re: SDM Rainier

Rainier's ultramatch barrels are the best i've ever shot in 5.56

My Ultramatch upper is incredible... i've shot many a sub 1/2 moa group with factory match ammo.
 
Re: SDM Rainier

The barrel is a ultra match SDM. She is definitely a shooter.
 
Re: SDM Rainier

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: BigBlue&Goldie</div><div class="ubbcode-body">
Here is Sun Devil's response to the 6061 vs 7075 and billet vs forged issue:

"well guys, thought maybe we should respond to this one. some of you are stating that the 6061 alloy is inferior to the 7075, and that this is a big issue for you. there are several types of 6061 aluminum. we use 6061-T651. its the strongest of the 6061 and actually has a greater elongation than any 7075 of the same thickness. what does that mean? it means the material will have some give to it before it snaps, meaning less brittle. 6061-t651 has a elongation of 10% where as 7075 only has an elongation anywhere between 3-10% on the same thickness of material. it also has a tensile strength of 42,00 psi. there are several types of 7075 that have that same tensile strength. do you know what type of 7075 your lower is? are you sure your lower is made with the strongest 7075 available? i can tell you its not because the price you would pay would be substancually higher for your lower.

we here at Sun Devil Mfg do use the 6061 for several reasons. conturary to what has been posted, its actually a lot more corrosion resistance than 7075. it also holds an anodize better than 7075. we hard anodize are lowers making the anodize thicker. 6061 is cheaper and its easier to machine. we dont use forged molds like all other lowers. some people are claiming that a forged lower is stronger than our billet lower. what happens when something is forged. 2 parts are pressed together at extreme pressure which causes the molicules to align, creating a stronger product than say a cast part. now how do we get our blocks of aluminum? they're not from a cast block thats for sure. when we buy a bar of stock aluminum, say 12 ft long, we get it in our desired dimensions. how do the metal companies get those dimensions? they press the metal to the desired size, just like a forge. all the strength of a forged product is there. now that we have a forged brick 8" in length we can start our machining process. this means we dont have to rely on the 3 or so main companies that supply all the other lower manufactures w/ their molds. "

</div></div>

This all may be true, but their spelling and grammar are so poor it seems a stretch to assume their metallurgy is accurate.
 
Re: SDM Rainier

In response to Sun Devil's response:

True: A forged part is stronger because it was formed under very large compressive forces aligning the molecules.

False: Machining from a forged block of 6061-T6 is as strong as a forged part.

It is irrelevant that the initial material they begin machining is a forged block because once you start machining you disrupt the molecular grain structure of the part (at the surface)! The surface is most vulnerable since imperfections from machining, grinding, pitting, etc. are point sources for stress risers leading to fractures and failures.
 
Re: SDM Rainier

Rainier makes some really good quality, accurate AR,s and their customer service is awesome too.
OP, good shooting and nice setup
 
Re: SDM Rainier

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: RotARy15</div><div class="ubbcode-body">I've often wondered why I never see left side charging uppers.</div></div>
ASA & DPMS both make one, or did you mean that you don't see people using them a lot?