-JQ- Posted December 18, 2008 Share Posted December 18, 2008 I don't know one from the other but I'm mid build and was asked "which gas block do you want?" I have no idea but I guess I need one. This is for a 18" barrel 3gun 5.56 running a Miculek (sp) comp. It will have a FF front end and no front site tower... Thanks! Link to comment Share on other sites More sharing options...
ken hebert Posted December 18, 2008 Share Posted December 18, 2008 If it doesn't matter to you, or if the FF tube is going to cover it up, the GB gas manifold from Brownells is the cheapest one they sell. I've used it on two different builds for myself and am happy with it. Link to comment Share on other sites More sharing options...
d5357 Posted December 18, 2008 Share Posted December 18, 2008 (edited) if the FF tube does not cover the gas block DPMS makes a nice 4 rail gas block, good for mounting anything. Mfr: DPMS Versatile Platform For Sighting & Lighting Accessories Four Picatinny rails allow you to mount the right accessories for the task at hand. Lets you attach an iron sight, laser, night vision device and flashlight, all at the same time. Accepts Picatinny or Weaver-style rings. Attaches with dual set screws. Models for standard, .750" diameter barrels and .936" diameter, heavy, match barrels. SPECS: Aluminum, black, anodized, matte finish. 1¾" (4.5cm) long, 1½" (3.5cm) wide, .750” (19mm) or .936" (23.8mm) I.D. Edited December 18, 2008 by d5357 Link to comment Share on other sites More sharing options...
HighVelocity Posted December 18, 2008 Share Posted December 18, 2008 I'm using the YHM gas block with the flip up front sight and I really like it. http://www.midwayusa.com/eproductpage.exe/..._campaign=10636 Link to comment Share on other sites More sharing options...
elynch2007 Posted December 18, 2008 Share Posted December 18, 2008 If your 18 in gun has a middy gas system you will need an adjustable gas block. Link to comment Share on other sites More sharing options...
HighVelocity Posted December 18, 2008 Share Posted December 18, 2008 If your 18 in gun has a middy gas system you will need an adjustable gas block. Really? I have a 16" bbl and a midlength gas system and it runs 100% without an adjustable gas block. Why would an 18" need the adjustability? I'm not being a wise guy, I really don't know the answer and am curious. Link to comment Share on other sites More sharing options...
GentlemanJim Posted December 18, 2008 Share Posted December 18, 2008 If you like tweeking your gun..an adjustable allows that A plain old block will do the job..or a standard front sight assm cut off. If you think you need gadgets hanging on it ...get a railed one. Not much magic Jim Link to comment Share on other sites More sharing options...
Merlin Orr Posted December 18, 2008 Share Posted December 18, 2008 ....or a standard front sight assm cut off.... Not much magic Jim A plain jane front sight - cut down - with a little work from your grinder and belt sander makes a fine setup... even looks pretty good and streamlined. Link to comment Share on other sites More sharing options...
warpspeed Posted December 18, 2008 Share Posted December 18, 2008 ....or a standard front sight assm cut off.... Not much magic Jim A plain jane front sight - cut down - with a little work from your grinder and belt sander makes a fine setup... even looks pretty good and streamlined. + 1 Link to comment Share on other sites More sharing options...
ERIC Posted December 18, 2008 Share Posted December 18, 2008 If your barrel came with a front sight assembly, I'd grind it down. If not and your barrel has a mid length gas system, I'd go with a low profile like a Larue. This gives you the option to run a longer FF. If your barrel has a rifle length gas system, you could go with any gas block. There are standard alum ones for around $35. If you like to tinker with stuff, get an adjustable block from JP. Link to comment Share on other sites More sharing options...
Dan Sierpina Posted December 18, 2008 Share Posted December 18, 2008 ....or a standard front sight assm cut off.... Not much magic Jim A plain jane front sight - cut down - with a little work from your grinder and belt sander makes a fine setup... even looks pretty good and streamlined. That is sooo 1980's I just make my own. Link to comment Share on other sites More sharing options...
-JQ- Posted December 18, 2008 Author Share Posted December 18, 2008 Thanks gang! This build is trying my patience a bit. First, learning about all the AR stuff...then getting laid off in the middle of a build...I agreed to a trade deal on this AR weeks before the job thing. A really nice pistol for the AR - the guy is putting it together pretty much how I want - if I only knew what I wanted at the start. This is going to be sweet when done - of course due mainly to this site and all you guys helping. Now I know tons more than I did...but my patience is dimming...not the guys fault just bad timing. I can only play with my new burris XTR so much without a gun to put it on To answer one of the questions...no I don't want to tinker with it...I just want it to run. I'm not worried about recoil impulse, etc...I'm a big fan of 7.62...I love recoil impulse... Link to comment Share on other sites More sharing options...
jhendri2 Posted December 20, 2008 Share Posted December 20, 2008 What kind of free float tube are you getting? For gas blocks, look at Larue Tactical (also for the FF tube) and VLTOR if the FF tube will cover the sight. I wouldn't get an adjustable block, just me though. On the 18" are you running a middy tube? Jim Link to comment Share on other sites More sharing options...
get2now Posted December 20, 2008 Share Posted December 20, 2008 ....or a standard front sight assm cut off....Not much magic Jim A plain jane front sight - cut down - with a little work from your grinder and belt sander makes a fine setup... even looks pretty good and streamlined. + 1 + 1 more Link to comment Share on other sites More sharing options...
9MX Posted December 20, 2008 Share Posted December 20, 2008 My upper is a 16 inch WOA bbl, midlength gas system. I used a VLTOR low profile gas block hidden by a Troy FF HG. It has seen more than 1,000 rounds. No hiccups so far. Link to comment Share on other sites More sharing options...
Jaxshooter Posted December 20, 2008 Share Posted December 20, 2008 JP if you are going with an adjustable gas block. Link to comment Share on other sites More sharing options...
elynch2007 Posted December 20, 2008 Share Posted December 20, 2008 If your 18 in gun has a middy gas system you will need an adjustable gas block. I should have said may want instead of need an adjustable gas block. The main reason for me is not the normal less recoil (it is a .223) or faster follow up shot. The middy gas system has more than enough pressure and pulse time to work great. A person I trust told me to remember that AR's crap where they eat, and by using an adjustable gas block you can reduce the extra gas and dirt that is common in AR's. That being said I just completed a 18in with a rifle gas system and used a low profile gas block, and it works great. Link to comment Share on other sites More sharing options...
-JQ- Posted December 20, 2008 Author Share Posted December 20, 2008 If not mistaken it has a rifle length gas system. It should be in my hands by Christmas?! The FF hand guard is just an aluminum no rail tube style. I may go carbon for weight savings down the road...maybe not. This rifle deal has been very educational. I intended to just buy a "rifle"...or rather, trade a nice pistol for a nice rifle. This is a guy I've known and dealt with so no problem there...just figuring out all the details...has been educational. Link to comment Share on other sites More sharing options...
Dan Sierpina Posted December 20, 2008 Share Posted December 20, 2008 If not mistaken it has a rifle length gas system. It should be in my hands by Christmas?!The FF hand guard is just an aluminum no rail tube style. I may go carbon for weight savings down the road...maybe not. This rifle deal has been very educational. I intended to just buy a "rifle"...or rather, trade a nice pistol for a nice rifle. This is a guy I've known and dealt with so no problem there...just figuring out all the details...has been educational. In my experience, the carbon handguard is better in regards to heat. It doesn't get hot after a 40 round stage, and it doesn't get real cold on a fall day. Link to comment Share on other sites More sharing options...
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