Meet my latest build - with special thanks to Dellet

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Flatliner
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Meet my latest build - with special thanks to Dellet

Post by Flatliner » Sat Jul 14, 2018 9:22 am

LONG post with lots of pics:

I got the chance to attend a carbine class last Sunday and use my latest build, an SBR built on an 80% BRS billet receiver set. She ran like a dream and is producing a little better than MOA accuracy right off the workbench with the 300 upper. The 5.56 upper, not so much, I have some work to do there. I want to offer a shout out to Dellet too. I got it finished WAY later than planned and had almost no time to work up a load. He was gracious enough to look at the details of the build and what components I had on hand and with his advice, I had a working, accurate load developed in an afternoon.

Here are some pics, I will give you the details after the pictures.
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As for the build, I really enjoyed doing it BUT it turned into a 2 year process. This is my first SBR that I originally intended to have done LAST summer.

Parts -
* Receiver Set - BRS 80% unfinished with an extra upper. I had the CNC engraving done professionally before doing the 80% completion myself. I then had it anodized to mil-spec. The serial number has significance for me which you can likely figure out for yourselves. I also had position 3 engraved with the 'I Wish' because I do... As for the BRS set, I likely wouldn't buy another one. The dimensions on the lugs are just plain sloppy. I was pretty disappointed with that part.
* Barrels - the 300 barrel is a MASP branded 1:8 Heavy Profile barrel that I believe is OEM'd by Ballistic Advantage. I had the length cut down to fit the handguard and leave enough room for the Supressor Cover. The 5.56 barrel is a 1:7 M4 profile that was shortened as well. Both barrels have ASR Breaks that were timed rather than shimmed.
* Hand-guards are both 10" Knight Rails from Fortus because I like the look. The middle sections are M-Lock
* Scopes are both Primary Arms ACSS - 300 is 1-6 the 5.56 is 1-8
* Mounts are both Burris Peeper but not the quick release. I debated that back and forth but in the end went with what was in stock locally
* Trigger is a Giessle SSA-E that I love. I may try a new trigger on my next build but I really enjoy this trigger and have a lot of rounds on one.
* Bolt and BCG is a JP Low Mass and it is the first time I have used one. OMG - AMAZING component. Truly, as fast as I could pull the trigger and the chevron in the scope simply didn't move. NO MUZZLE RISE at all, NO sight picture realignment, is simply stayed on target.
* Gas Blocks are both Odin Works adjustable. I did have the barrels dimpled but I am not sure it was really that necessary.
* Finally my favorite part of the whole project. MASP Industries charging handles. I have shot SO many charging handles over the years I have lost count. These are hands down the best.
1.) the gas diversion is the best I have ever seen. VERY well designed. Regardless of back-pressure and rate of fire, I simply don't get gas back in my face at all.
2.) the designs are truly ambidextrous. One is the traditional type but with better, far less sloppy tolerances. The handle part is interchangeable and they have lots of options.
3.) the one design is actually latchless AND works with suppressed rifles. Basically you can adjust and tune the spring tension for your rifle/load combo like a gas block.
edit - * Forgot about the LAW folding stock adapter. Only bummer with it was that I couldn't use my silent captured buffer spring. MASP agreed to make a different extension for me that will allow it in the future BUT I had to deal with the spring twang for now.
edit - * The bolt release is the Giesle enhanced but I just put that on this morning so no experience with it yet...

If there is interest in the handles, I asked the owner of MASP and he said he would do a group buy on them.

I am happy to answer questions if you have any about the build or the class. I will be posting more as I play with loads, and try to get the 5.56 set up to run a little better.
Thanks for reading if you are still engaged by this point in the post.
Last edited by Flatliner on Mon Feb 04, 2019 11:53 pm, edited 3 times in total.

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dellet
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Re: Meet my latest build - with special thanks to Dellet

Post by dellet » Sat Jul 14, 2018 11:54 pm

Did you do the whole class with the subs, or did you swap uppers?

And I am interested in the charging handle, what makes it different?
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Flatliner
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Re: Meet my latest build - with special thanks to Dellet

Post by Flatliner » Sun Jul 15, 2018 7:50 am

I did do the whole class with subs but that probably wasn't the best choice for the 100 yard stuff. Since it wasn't really a competition, I wanted to see how the load with the 180 grain subs held up to the 'default' on the reticle for 100 yards. Unfortunately the group size opened up so much I am not sure I answered that question. (That was shooter and the weird positions we were shooting from)

As for the handle, the mechanical one isn't really unique, just held to tighter tolerances so it 'feels' higher quality than the similar designs I have seen. The latchless one however IS unique on the market. There were a few out a number of years ago but to my knowledge nobody is still doing them. The latch is held with spring tension. The problem has always been that they don't work with suppressed rounds because they kick out of battery with the increasing backpressure during rapid fire. What MASP did is patent a design that allows the spring tension on the latch to be user adjustable. One of the machinists from his shop was also in the class. It was his first time with a new rifle in 5.56. 10ish min into the class we did have to adjust his tension about 1/4 turn tighter but then he ran all day without a single problem. The walk back to my tool box took longer than the adjustment.

Here is the latchless:
http://www.maspindustries.com/MASP-Indu ... _3995.html
Here is the Throttle:
http://www.maspindustries.com/AR15-Thro ... _4109.html

One other thing that I can't totally explain. I have always gotten at least a little gas back in my face with rapid fire strings on anything I have shot that was suppressed (rifle). With these handles (both of them) that has never happened.

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dellet
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Re: Meet my latest build - with special thanks to Dellet

Post by dellet » Sun Jul 15, 2018 11:48 am

If you have a different/regular charging handle, swap it out and run a few. Then you can have an idea of the difference the powder makes vs the charging handle. Sounds like the combination works really well though.

Subs at 100 is more difficult than people think, take the rifle off the bench and a lot of people struggle with supers. Gives you a reason to practice. :P
300 Blackout, not just for sub-sonics.

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Dolomite_Supafly
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Re: Meet my latest build - with special thanks to Dellet

Post by Dolomite_Supafly » Sun Jul 15, 2018 1:42 pm

Those Primary Arms scopes are amazing. I’ve never been a fan of BDC reticles but theirs work great.
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Flatliner
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Re: Meet my latest build - with special thanks to Dellet

Post by Flatliner » Sun Jul 15, 2018 3:24 pm

dellet wrote:If you have a different/regular charging handle, swap it out and run a few. Then you can have an idea of the difference the powder makes vs the charging handle. Sounds like the combination works really well though.

Subs at 100 is more difficult than people think, take the rifle off the bench and a lot of people struggle with supers. Gives you a reason to practice. :P
I know the powder makes a big difference, however, I have been running the prototype of this handle on my pistol for over a year. Lots of different factory and reload ammo, both supers and subs. It really does divert the gas amazingly well. I do agree that a side by side is appropriate. I think I will do that and video the results with several shooters.
Last edited by Flatliner on Sun Jul 15, 2018 3:27 pm, edited 1 time in total.

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Flatliner
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Re: Meet my latest build - with special thanks to Dellet

Post by Flatliner » Sun Jul 15, 2018 3:25 pm

Dolomite_Supafly wrote:Those Primary Arms scopes are amazing. I’ve never been a fan of BDC reticles but theirs work great.
I totally agree Dolomite. I have several of their scopes. I think they have nailed the Price:Value ratio for the AR platform really well with both these scopes and their red-dots.

Smurky
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Re: Meet my latest build - with special thanks to Dellet

Post by Smurky » Sun Jul 15, 2018 6:34 pm

Very, Very Nice build, one thing you may want to try is the Radian Arms Talon safety, works in either 45 or 90 and the levers are dove tailed and held by pins and will not loosen.

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VENT625
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Re: Meet my latest build - with special thanks to Dellet

Post by VENT625 » Mon Jul 16, 2018 2:56 pm

Nice build!! Those charging handles are interesting!!
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Freedom1973
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Re: Meet my latest build - with special thanks to Dellet

Post by Freedom1973 » Mon Jul 16, 2018 7:08 pm

Bravo on your build! Nice to see people putting in time on classes/training as well.
Big Gas busting ambi latch? I am in!

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