Les Snyder

not super light, but basic set up I just built...Brownells BRN22 receiver with integral rail( I had mounts loosen on my 10/22 for STC), and 16" sport profile barrel... PMACA lightweight chassis...Ruger bolt, charging handle and BX trigger group (from Brownells, you need to look as the complete kit is considerably cheaper than individual parts)... short Magpul vfg on the front extension...Hogue over molded pistol grip, and AR adjustable stock with SOCOM angled cheek .... sight is a Vortex SPARC... shoot CCI Blazer had ejection problems with Ruger 15 round mags.... if you look on the internet there are a variety of ways to tighten the front to rear clearance (noticeable difference in length of 10 round rotaries and the extended mag... a piece of duct tape on the "bump" and a second over the bump and sides for a trial tightening solved the problem... will use 10 rounders for competition in the future

Memphis... you may have already answered this, but at 72 I have serious case of CRS,... what lower do you use? CMMG tech support (Brian) is sending me a new extractor... I ordered a couple of the BCM springs I may have to look at the use of factory Glock magazines again...now that I have a little better understanding of the quirks of the sharp teeth on the bolt...I want the bolt to run free without hitting anything when it is cycled with an unloaded magazine inserted

Archangel.. no, just an upper I had on hand Memphis... thanks for the reply, I have contacted CMMG tech support and commented that others had problems with the plug... if the O ring does not work, will try the extra power spring...I tried lowering an NFA mag catch shelf about .070" and it would not strip a round, that is why I was modifying the nose of the follower.... the MagPul mags sit lower and do not interfere with the back edge of the bolt when it is retracted all of a sudden in the match (naturally) weird stuff was happening... the blow back upper is sitting in the gun safe laughing

bwikel.. thanks for the reply... sorry, I didn't take any pics of the spot, and tried running a Swiss file across it which obliterated the mark... I have access to a fairly precise disc sander tomorrow, and will try to remove a small amount and ink it to see if I can see a contact spot...my original statement was slightly incorrect as I retained the plug initially and added the O ring when I got the failure to extract... have since removed the plug, and kept the O ring, the tension seems more reasonable, and the combination has always worked with my 5.56 carbines...I am wondering if the plunger ejector is allowing the short 9mm case to release from the bolt too early, and possibly bouncing around... for the brass that does eject, they end up about 10 ft at 4:00 ...I use an outside range on Wed where I am more free to play with the carbine did you lower your mag catch shelf, or need to modify magazines? Les

I've been shooting a CMMG RDS barrel and bolt in an home assembled carbine, not one of their dedicated lower/upper.. NFA Glock billet lower, Aero Precision upper... after some initial problems getting the magazine follower to clear the sharp locking lugs on extraction, it shot flawlessly for the last 6 months or so... last match I had multiple double feeds, which I attributed to the 40 round ETS mag with a trimmed follower nose.. I pulled the bolt apart and noticed that the elastic plug in the extractor spring was exceptionally hard, so replaced it with a BunaN "O" ring around the spring... testing Wednesday, with MagPul mags that clear without modification, I started having failure to extract problems... upon disassembly, noticed a bright spots on the nose of the extractor where it might have been bumping the barrel extension... the extractor nose appears to be below the face of the bolt.... will trim it a little... anyone else have any delayed symptoms like this... regards Les L747

my SBR uses one from Macon Armory... the production shop makes adapters from Rudy's design for a variety of outlets... it is for Colt (Metalform) magazines... bottom load with a button head cap screw that holds it in the mag well, and two tension set screws in the forward portion to engage the mag well

I'm not that sophisticated... I shoot out of a Husky tool bag hooked to a modified baby stroller by cheap snap links... I just throw the shorter reload magazines for my RD bolt (Magpul with a loop of blue tape to identify them) in a zip loc bag, the 40 rd ETS and ETS 32 w/TF base in the top of the bag... keep the mags for the G17 in another bag and seal them from the elements.. I shoot the same load in both, and keep cartridges in a bag also... I throw a water bottle in the top of the bag while it is being used, and the bags keep the condensation from getting anything wet...

I ran into barrel battering (bolt was starting to peen the barrel shoulder) when I used a .308 spring and 6.2oz buffer... currently using an Enidine hydraulic...I'm old, so my trigger time is most likely a lot slower than yours, but with a 142 power factor load of 3.5 WSF and 135 Bayou coated did not notice any sluggishness with the blow back...the radial delay bolt has a slightly slower cycling impulse and that is the trade off for less dot movement, but I can't out run the trigger (RRA NM)

both my PCC and 5.56 have Viet Nam era A1 fixed stocks, with rounded butt pads...

vortex venom on YHM 1/2" riser has replaced the earlier vortex SPARCII

as above, my PSA upper/NFA lower as a blow back ran for 2 1/2 years without a problem... has been updated to a radial delay my observation is not the same as yours... most of the competitive guys are tinkering to get the least amount of dot movement, and sacrifice reliability for speed... they are the cause of the malfunction not the platform, and when they get it figured out, have a reliable platform on the AR, or they wouldn't use it

have you thought about one of the CMMG radially delayed bolts/barrels?.... I've been playing with one for about 6 months now, and after some experimentation with modifications to magazine followers, like that it cuts a lot of reciprocating weight out of the bolt and carrier... with a 142pf Bayou 135 load, hydraulic buffer and modified Miculek comp, I get the least amount of dot movement in the over 3 years I've been shooting a PCC... compared to L9x25's aluminum shrouded blow back with 100 grain bullets, I get negligent dot movement similar to his... his light barrel is easier to swing, but his recoil impulse is straight back and more noticeable, but the end result of no dot movement is about the same at 72 I'm low speed and high drag, so my carbine is not the limiting factor in my performance, but it is fun to attempt to work out problems... regards

Barry... that's not soot, but a secretly formulated lubricant

I have two CMMG dedicated .22lr uppers, one a 16" and the other about 10"... the 16" is fitted with a Vortex SPARCii and is my practice rifle for PCC... the short 10" upper has a Vortex Venom on a YHM riser and tops my registered SBR and I use it for Steel Challenge...the lower is pretty straight forward... RRA NM trigger, ambi safety, Hogue grip, pressure plug in the buffer... fore end is a short Palmetto State unit that I really like the feel of... a piece of 1/2 aluminum is attached as a hand stop... it tracks very quickly... I have the CMMG polymer charging handle to lessen problems of ejected brass being caught... I filled the 16's charging handle with epoxy to do the same thing I originally used SW15-22 magazines and a Boonie Packer Reddi Mag adapter for use with the Smith magazines... with a lot of use the feed lips were grooved by the rim of the cartridge, which led to feeding problems... so am now using the Black Dog X form mags with stainless feed lips... the newer beam welded magazines seem to have a better investment casting to the lips...I use CCI Blazer... clean the chamber and run the gun wet... no major problems... even though it is a .22lr, pull the rifle into your shoulder

I've recently started shooting Carry Optics for Steel Challenge, and wanted to duplicate the sight picture with my .22lr Advantage Arms practice upper (G17 with Apex trigger)... installed a DPP 7075-T6 dovetail adapter plate for a spare Venom... the added weight puts the already marginal function combination at risk... it does make you hold the pistol securely... I removed the end retainer of the captured factory spring to give the spring a little more travel... the original spring wire is .033".... I replaced it with a .0355" wire of the same length in an attempt to return it to battery better, but could not get it to cycle when shortening it at the range, coil at a time... I get better function (nearly 100 per cent) if the magazines are downloaded to 5 round to lessen the drag on the slide...other than milling away some weight do any of you have a suggestion?...ammo is CCI Blazer that works well in my SW M41 and my AR .22lr uppers... thank you Les Snyder L747

I use an aluminum mag block from Macon Armory, but it is similar to several on the market... bottom load and held in place with a button head cap screw and small washer... it holds tension by two set screws that apply pressure against the forward edge of the mag well.... which can be tightened down pretty well to help limit motion... but...any gun smith or competent amateur tinkerer should be able to drill and tap a small hole at the base of the mag block, and using a similar cap screw and washer to the one at the top, and lock the adapter solidly in place

just a follow up... my 40 round ETS worked fine at today's match...easy to load without the use of a loading tool

Sergio... what is your overall length with the coated bullets?... I'm running Bayou coated 135s at 1.10"....first impression was good, no problems... first match Sunday, will see if the first look was indicative

my ETS easily loaded 40 without a loading tool... modified for the radial delay bolt, worked fine on the trial run

CBRussell.... you will find a variety of springs and buffer weights being used for USPSA., depending on shooter perception... recoil reduction, or reduction of dot movement... I can live with recoil, if the dot doesn't move... power factor is naturally an important variable, and I would suggest you determine the power factor before you attempt to tune the carbine..... I use a rifle length buffer tube, and the extra length of the rifle buffer allowed me to initially play with a variety of different weight systems, that were inexpensive... I use a standard rifle length spring... I load only one 9mm on the Dillon, and it is a 135 Bayou coated using WSF.... 130pf out of the G17, and 146 out of the PCC (I'm giving up a bit) in a rifle length buffer filled with 7 1/2 lead shot... 6.0 oz 1/2" brass rod.. 6.2 oz 5/8" brass rod..7.0 oz filled solid lead.. 9.0oz I initially found the 7.0oz buffer to work best for my set up, but later switched to the current use of an Enidine hydraulic buffer (from my 5.56 rifle) and standard rifle spring with the modified Miculek comp I described in another topic, I get imperceptible dot movement with a double tap at 25yd Les L747

I'm not familiar with a Stag Arms ejector in particular... you might ink the inside edge with a marker and set it so there is a slight drag mark from the bolt....does a piece of brass lock in place when placed under the extractor, between the claw and edge of the bolt face?

Roy... I think Howard is going to one-up you on your pen barrel sight on the Lab Radar... he mentioned something about making a mount for an extra Fast Fire sight

followup to my Sept 5 post... I opened all three cuts an equal amount at the top of the Miculek, leaving only a .175" bridge between the radius on each side... clocked at 3 o'clock, the dot does not move with double taps on a 25yd plate CMMG radial delayed bolt and barrel Enidine hydraulic rifle buffer in A1 stock modified Miculek comp (if interested please read my Sept 5 post) load is Bayou 135 with Super Field.... 146 pf

just received my 40 rounder from ETS... to prep the new magazine for radial delay bolt clearance, I got my miniature milling machine out (aka Dremel with a 9/64 drill bit) to massage the rear bolt clearance window, and trusty sanding drum to reduce the nose of the follower... adding a new "sand" release hole in the process to allow any debris to get off the nose of the follower ... ran the dummies fine... will try shooting it Wed when Howard gets his new Lab Radar on line, and will see if I really make minor with my new reduced load... I use the same load in the Steel Challenge Glock as well as the AR9 for PCC... regards

my buffer spacer came from New Frontier