GentlemanJim Posted January 4, 2007 Share Posted January 4, 2007 Sirs, I would like to build up an ar for open ,and I like short guns for quick close encounters. Do the short guns make enough fps with milspec ammo to make the PF required?? I know a well built short gun can be accurate enough. Thanks ..Jim Link to comment Share on other sites More sharing options...
uscbigdawg Posted January 4, 2007 Share Posted January 4, 2007 (edited) Made it with room to spare on my 16" with Ultramax Remanufactered 55gr. ammo. Rich ETA: So I don't see a problem making it with the 69gr. SMK's and approx. 2800fps loads that I will be using. Edited January 4, 2007 by uscbigdawg Link to comment Share on other sites More sharing options...
Bear1142 Posted January 4, 2007 Share Posted January 4, 2007 Jim, Yes. The PF was reduced to 150 (bullet weight x velocity/ 1000.) You'll need 2728 fps. minimum to make minor with a 55 gr. Mil-spec. load. Federal XM193 or Lake City should have no problem making it. Erik Link to comment Share on other sites More sharing options...
GentlemanJim Posted January 4, 2007 Author Share Posted January 4, 2007 Very cool!! thanks !! I have a rock river mid . I would like a 16'' JP bbl and comp with as long a gas sys that will fit. Maybe a drop in trigger and some good glass and free float.. Thanks for the info..Its hard to make a good decision without the facts!! ...Jim Link to comment Share on other sites More sharing options...
benny hill Posted January 4, 2007 Share Posted January 4, 2007 A 20" gas system is faster up close when cut down to 18". You can stay on target easier than with a 16" system. Most all the fast 3-gunners use this. Link to comment Share on other sites More sharing options...
GentlemanJim Posted January 4, 2007 Author Share Posted January 4, 2007 Thanks Benny! So with an 18" plus about 2" for comp you get a 20" gun?? Link to comment Share on other sites More sharing options...
smokshwn Posted January 4, 2007 Share Posted January 4, 2007 Jim, What Benny is trying to point out is that with a 16" gun the longest gas system you can get is mid length. This results in the gun being a little more violent when fired. However if you go with the 18" barrel you can have a full length gas system and have a gun that shoots smoother. Given that there is seldom a time when the 16" gun has any advantage in our sport on length time wise, however you will always be saving time with a gun that is so stable it allows you to double and triple steel targets at distance. Link to comment Share on other sites More sharing options...
GentlemanJim Posted January 4, 2007 Author Share Posted January 4, 2007 Thanks ! I have not shot ipsc rifle since 1988 and that was a 24'' gun. I just thought a short gun was much quicker up close. I allways listen to people who have the experiance. I appreciate your input! Jim Link to comment Share on other sites More sharing options...
Bear1142 Posted January 5, 2007 Share Posted January 5, 2007 I just thought a short gun was much quicker up close. It most certainly can be, but it depends on stage design and whether or not the shooter has the skill to exploit the advantage. Erik Link to comment Share on other sites More sharing options...
DogmaDog Posted March 9, 2007 Share Posted March 9, 2007 Two questions: 1) How about a 14.5" barrel with comp...are those making minor, or is it iffy. 2) CMMG sells 16" barrel with rifle length gas system. (www.cmmginc.com). Do these things work? Would they work with decent 55 gr ammo? What do you think? DD Link to comment Share on other sites More sharing options...
D.Hayden Posted March 9, 2007 Share Posted March 9, 2007 .223 ammo is all over the board.. I'd be surprised if XM193 ammo didn't make minor in every rifle out there. In 18-20" barrels it's probably 3,200-3,300+ fps.. But some ammo is close to 2,800 in 18" barrels, might (probably) be an issue there. Link to comment Share on other sites More sharing options...
Patrick Sweeney Posted March 9, 2007 Share Posted March 9, 2007 The quick answer is; if it is factory, and you have anything 14.5" or longer, you are almost certain to make Minor. I had some loads (over half) that made Minor out of a 11.5" barrel. As I recall, there were no loads that failed to make Minor out of a 16" barrel, even the excreble British Radway Green 5.56, down-loaded to keep their miserable SA80s from falling apart. Link to comment Share on other sites More sharing options...
Merlin Orr Posted March 9, 2007 Share Posted March 9, 2007 ........the excreble British Radway Green 5.56, down-loaded to keep their miserable SA80s from falling apart. So Patrick....Tell us what you really think..... Link to comment Share on other sites More sharing options...
Patrick Sweeney Posted March 9, 2007 Share Posted March 9, 2007 I once spent an entire afternoon de-bugging a departments ARs, until someone happened to walk up holding one of the bandoliers of RG ammo. "You b*st*rds! Why didn't you mention this hours ago?" Link to comment Share on other sites More sharing options...
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