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When you guys say " Blackout and Micro Length are the 2 lengths for subs " meaning two different Gas Lengths, then which one should I buy for 300 BLK Subs ? Blackout Gas Length or Micro Gas Length ? They both seam similar to me, why would you choose one over the other ?
Which one of them would cycle more reliably than the other for 300 Subs ?

Thanks again for any help.
Yeah
 

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Discussion Starter · #22 ·
I apologize for asking lots of questions. All of you guys are very smart and I have a lot of respect for you guys, especially Navalbeaver, Northern, Roflicopters, and Sean. You are very knowledgeable on the XCR. You guys are very Experienced with multiple variations of XCR guns, but I have never even held one in my hand yet. I don't blame you guys for getting frustrated with my questions, but put yourself in my shoes, there are tons of variations of the incredible XCR and the configurator can never show me as much information as you guys know in your heads. That is why I asked you all for help.
I was really getting excited and so close to figuring out which one would be my first XCR purchase, but that last reply really took the wind out of my sail.
I had narrowed it down to only two choices and I was ready to place my order, but I wanted to check with you guys first because I had that much respect for your input. I work hard for my money so I did not want to spend $2,400 on a gun and then find out after it is delivered 6 months later that I should have ordered it with a "Micro Length gas system" instead of a "Blackout Length gas system" or visa versa.
Thanks to all of your good feedback, I had narrowed my choice down to purchase one of these two specific models for my first XCR.

XCR-L 300 BLK Standard SHORT Gas System (buried gas valve) with 11 inch barrel
or
XCR-L 300 BLK Micro (exposed gas valve) with 9.5 inch barrel, but per RA website the Micro is not recommended for use with my suppressor unless only shooting Subsonics.

Thanks again for helping me learn by sharing your knowledge and Experience with a fellow Pro 2nd Amendment American on The 4th of July today. God Bless America !!
 

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I apologize for asking lots of questions. All of you guys are very smart and I have a lot of respect for you guys, especially Navalbeaver, Northern, Roflicopters, and Sean. You are very knowledgeable on the XCR. You guys are very Experienced with multiple variations of XCR guns, but I have never even held one in my hand yet. I don't blame you guys for getting frustrated with my questions, but put yourself in my shoes, there are tons of variations of the incredible XCR and the configurator can never show me as much information as you guys know in your heads. That is why I asked you all for help.
I was really getting excited and so close to figuring out which one would be my first XCR purchase, but that last reply really took the wind out of my sail.
I had narrowed it down to only two choices and I was ready to place my order, but I wanted to check with you guys first because I had that much respect for your input. I work hard for my money so I did not want to spend $2,400 on a gun and then find out after it is delivered 6 months later that I should have ordered it with a "Micro Length gas system" instead of a "Blackout Length gas system" or visa versa.
Thanks to all of your good feedback, I had narrowed my choice down to purchase one of these two specific models for my first XCR.

XCR-L 300 BLK Standard SHORT Gas System (buried gas valve) with 11 inch barrel
or
XCR-L 300 BLK Micro (exposed gas valve) with 9.5 inch barrel, but per RA website the Micro is not recommended for use with my suppressor unless only shooting Subsonics.

Thanks again for helping me learn by sharing your knowledge and Experience with a fellow Pro 2nd Amendment American on The 4th of July today. God Bless America !!
I (We) don't mind answering questions. It's that they've been answered multiple times in this thread.

to recap.

standard gas length isn't an option because you want to run subs.

YOU need to figure out how much barrel you want....
7.5: short and it works. Has the theoretical potential to have issues with low pressure rounds. (MCX has a 6.75" and a 5.5" barrel and they run fine)
9.5: slightly longer but hits the sweet spot. If you don't mind the length, this is probably the best option.
11+: Your decision, but if subs are your primary interest, it's unnecessary length, will help slightly with the supers

ONCE YOU FIGURE OUT WHAT BARREL LENGTH..... WHAT UPPER DO YOU WANT TO PUT IT IN?
Micro: May be special order from RA but this is the only option that will give you an exposed gas block that will run subs.
Mini: Needs the MICRO gas for easy adjustability.
Standard: Needs BLACKOUT gas for easy adjustability.

RA is smart enough to pair the correct gas length with the correct upper

The micro gas length on a short barrel in 300blk DOES NOT HAVE ISSUES WITH TRADITIONAL SUPPRESSORS. That blurb is more for higher pressure rounds.

Multiple people have recommended the 9.5" before post #23(even though that was the 3rd time for him)

ETA: We aren't very smart... we've just been around the forum longer.
 

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Thanks guys... but now I've got the Chinavirus.
Hope you recover quickly.

Unfortunately, the XCR's modularity really adds to the confusion when ordering configurations and their website is constantly changing the configurator to reflect the way they are trying to standardize the platform since it's always evolving.

You want to run subs mostly. So, you only have 2 gas system length choices: Blackout or Micro.

To simplify....there's really NO DIFFERENCE in how they will function. The reason for the 2 lengths of gas systems (excluding the standard length that is not recommended for subs) is solely for accessibility (aka "lining up") the gas adjustment dial with the slots cut into the upper you choose.

Navalbeaver has answered all of your questions, but you still seem somewhat confused. That's largely b/c you're asking so many questions at once and are 'drinking from a fire hose' in terms of parsing the answers.

If you still have questions what I'd recommend is slow down and ask ONE at a time. We'll answer it and once on the same page, move to the next one.

I think I understand what you want overall but let me summarize:

You want an XCR in 300 BLK that you plan to run with a can and plan to run subs only. You want maximum reliability. You want an exposed gas adjustment dial.

If those are your parameters, as Nate (Navalbeaver) told you: you can only choose a micro upper to get the exposed gas dial. Problem is: the website no longer even shows the micro upper. Does that mean it no longer exists? I can't tell you. You'd need to call RobArms and ask, but it would seem they are moving away from the exposed blocks on anything shorter than the standard length gas systems.
 

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I did. He's trolling
Is he though? Maybe he just really is having a hard time understanding. With the difference in information here vs. RobArm's site (for example....we're telling him a Micro upper is what he needs for an exposed gas block....and it's not even available on RA's website) I say give the benefit of the doubt (for now).

Here's the thing though....Lex let people be absolute dumbshits or assholes. It just shows their level of intelligence or their true character anyway. Let users decide to block or simply ignore people who warrant it (provided it's not spam or unmarked porn).

What makes this place great is the fact that it's not overly moderated, that conversations flow naturally and that if you make an assertion or dumbass comment, we all use social pressure to get the person to back that statement or think it through/explain it.

JMO of course, and YMMV....I just see this sort of meddling as being counter to what this place has always stood for.
 
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I'm getting ready to buy my first XCR-L and I want it to be my Quiet Gun. We all have plenty of loud guns that shoot supersonic, so I would like this one to be dedicated to plinking ONLY Sub-sonic 300 BLK and Always shoot it With a Suppressor.
My concern is that I've heard shooting suppressed 300 BLK can be unreliable when using Sub-sonic ammo but Sub-sonic ammo is the only ammo I want to shoot in this particular gun.

Robinson Armament even says on their website quote " ....some barrel lengths may not work well with all calibers. For 9.5 inch barrels or to shoot Subsonic .300 BLK ammo, a shorter gas system is required that puts the gas block inside the upper (Buried). For barrels longer than 9.5 inches, it is best to use a longer gas system which puts the gas block outside of the Upper( Exposed)....unless you're shooting Sub-sonic 300 BLK, the Micro and Mini are not recommended for use with a suppressor unless it is a Flow-through suppressor or one with very little back pressure.

1. None of my suppressors are flow-through design with little back pressure so does this mean that the Micro and the Mini are less reliable with Sub-sonics than the longer standard barrel configurations ?

2. What is the Most Reliable barrel length for shooting suppressed 300 BLK Sub-sonics ?

3. For only shooting suppressed Sub-sonic 300 BLK, without a Flow-through Can, what would be the Quietest configuration that is still 100% reliable ?

4. Can I get either Micro or a Mini in 300 BLK and is one more reliable than the other when shooting suppressed Sub-sonics ?

5. How hard is it to adjust the gas if it is Buried ?

6. I think I want the gas block Exposed, but can get a 300 BLK with an exposed gas block on a Mini or only a Micro ?

7. Does the Robinson Armament website configurator actually show all of the possible combinations of configurations or are there other options not shown ?

Bottom line is I would hate to pay $2,400 for a gun and then pay one dollar per round for Sub-sonic ammo only to have an unreliable gun that jambs on me at the range.

Any Advice would be greatly appreciated. Even if you can't answer all 7 questions, please chime in on any that you can give advice on.

Thanks
For a buried gas block i made a tool for adjusting the gas setting.
Tool Bicycle part Wood Cylinder Gas
 

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When I put together my 300 Blk I based the decision upon the ballistics of barrel length and the length of the upper I felt comfortable holding. I left the gas system choice up to those that know best, Robinson Armament.
 

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Sean, you mentioned the micro upper is no longer shown on the configurator… has anyone talked to Alex to see whether it is completely discontinued?
No idea. It's just not there as an option, but that happens pretty regularly with the website. They change it and certain parts drop off or become non-functional (usually the latter)....which just adds to the confusion.
 

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I removed the warning, I understand that he might be wrapping his head around the flexibility of the platform, but it seemed like he was being obtuse about it. w/e
Oh, I agree. I had to stop myself from posting, "Perhaps this is too complicated a platform for you, lol". But, then I tried to put myself in his shoes and realized how confusing it would be to someone used to not having much choice in terms of gas system types/handguards/ gas lengths/bbl lengths/profiles...all on the same gun.

Plus, we tend to give very detailed answers....and I've learned most people have VERY short attention spans. TLDR is a real thing. Thanks interwebz. 🤣
 
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There really were multiple issues overlapping, which was also making it confusing. The names of the actual, available gas system lengths and their availability and result in different upper lengths would have been plenty for the thread, but the OP’s additional assumptions about the merits of exposed versus “buried” gas blocks made it too much. Of the available options in the current configurator, the 9.5” barrel with “buried” gas block would really give him what he wanted, ignoring his concern with nonexistent issues with the buried gas block.

The only gripe i have with the buried block/control is more my own problem to deal with — my old eyes struggle to read the numbers. I need to put some paint on the numbers.
 

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I love my blackout gas length and buried block with the 9.5" bbl in the standard upper. Good setup. Have the same thing in X39.....like that one even more.
 
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Yeah I feel the same. 9.5” x39 with blast shield is 💯.
Yeah, feel like at some point I'll order a 9.5 buried block for my 6.5G. The 11" bbl is fine....just feel like a 9.5" 6.5G might be my favorite.
 
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There really were multiple issues overlapping, which was also making it confusing. The names of the actual, available gas system lengths and their availability and result in different upper lengths would have been plenty for the thread, but the OP’s additional assumptions about the merits of exposed versus “buried” gas blocks made it too much. Of the available options in the current configurator, the 9.5” barrel with “buried” gas block would really give him what he wanted, ignoring his concern with nonexistent issues with the buried gas block.

The only gripe i have with the buried block/control is more my own problem to deal with — my old eyes struggle to read the numbers. I need to put some paint on the numbers.
RA should make a 3d gun builder like that ar15.com thing, then people can mix and match, and paint, then click order.
 
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