AR Technical Discussion [Archive] - Page 6

Ar15 build issue (15 replies)
MK262 and maintenance (14 replies)
LMT MRP barrel and upper cut down questions (8 replies)
Are these gas key screws properly staked? (69 replies)
Best cam pin? (4 replies)
300BLK SBR range report...Help (8 replies)
What's Your Parts Replacement Regimen? (11 replies)
Extractor Steels (10 replies)
Are AR-15's assault rifles? (1 replies)
Front Sight Post question (4 replies)
Colt 11.5 Hvy Barrel & Knights RAS (19 replies)
Lightest weight barrel profile you'd hang a suppressor off of? (11 replies)
Noveske Switchblock Info Sharing and Modification (12 replies)
Pulled Rear Take Down Pin All The Way Out (13 replies)
Bolt Carrier Markings (5 replies)
Problem extracting live round, Ring cut around bullet (19 replies)
Receiver extension inner diameter help (11 replies)
Colt 11.5 inch fbi barrel gas port size (22 replies)
First AR lots of malfunctions. (61 replies)
Choosing barrel (17 replies)
Electropolishing Barrels (11 replies)
Corrected! Colt Expanse CA factory version- flash hider: how attached? See Post #10 (9 replies)
Lessons Learned: Troubleshooting Shortstroking (9 replies)
Which barrel would you expect more consistent accuracy from? (9 replies)
KAC and Troy Front Sights (2 replies)
SLR Sentry 7 clamp on gas block? (4 replies)
More ACOG Reticle Measurements (0 replies)
Opinion on lightweight barrels (66 replies)
New Bcm exceptable or not (5 replies)
Tools for barrel dimpling for gas block (19 replies)
Looking for information on upper/lower wobble. (25 replies)
Pierced primers - monitor your brass (14 replies)
How much distance travel with each rotation on MD? (1 replies)
Removing weld/pin on muzzle device? (7 replies)
Looking for info on the C8 SFW CQB (12 replies)
Travis Haley on the different AR15 zeros. (35 replies)
New Magpul UBR-2 bolt not locking back on PMAGS (29 replies)
Larger Threads At End of Barrel? (24 replies)
LMT Enhanced BCG , small change (90 replies)
Port size for Daniel Defense 5.56 16" S2W mid-length barrel (and a question about it) (11 replies)
When dimpling/pinning a barrel for gas block install should I worry about bare metal? (13 replies)
Shooting AR with no gas rings (video) (22 replies)
DI buffer tuning with supressor and Gemtech carrier? (15 replies)
How does the M4's SOCOM barrel profile compare to the DD S2W profile? (6 replies)
Best repair & maintenance manual? (9 replies)
ANYONE EVER HAD PROBLEMS WITH THE HANDGUARD LOOSENING UP WITH A SLING (8 replies)
Buttstock question (11 replies)
Long-Term Storage: Materials, Mothballs, and Methods (16 replies)
FLUTED BARRELS - GOOD OR BAD (49 replies)
Question about multiple uppers for the same lower (38 replies)
BCM barrel & Geissele SGB set screw spacing, same? (3 replies)
What material (type of pin) should I use for permanent muzzle brake pin? (25 replies)
Blown primer...what next? (23 replies)
LOWER RECEIVERS QUALITY (75 replies)
Just installed Geisselle HS NM trigger on my A4 (5 replies)
LaRue QD, DD A1.5, LMT type and carry handle sights? (7 replies)
The story of my overgassed DD MK18 & DD CS (63 replies)
Chopping 20" USGI A2 barrel to 11.5" is it possible? (57 replies)
Hammer pin walking (10 replies)
WHERE TO GET THE BUFFER WEIGHT PADS (4 replies)
SOCOM Profile barrel with free float handguard (10 replies)
Mid length handguard with FSB (11 replies)
Will I need an adjustable gas block? (15 replies)
Colt 6933 chokes on PMC bronze (20 replies)
Why Not? Non-Jacketed Frangible (5 replies)
Nevermind, never going piston, DI forever. (17 replies)
Will the HK 416 upper work with a MR556A1 lower ? (1 replies)
Rockwell hardness on finishes (22 replies)
Shot peening (11 replies)
CHROME LINED BARREL BREAK IN PROCEDURE (62 replies)
Buffer correction for port size? (10.3"/Mk 18-inspired) (4 replies)
Possible Slamfire Cause? (12 replies)
Ballistic Advantage "Hanson" Barrel (7 replies)
11.5" Noveske vs Sionics port sizing report (0 replies)
16 Inch Middy Gas Port Diameter- What Works? (9 replies)
Will the KAC RAS II fit the COLT OEM2 - without modifications (12 replies)
Black Rain Ordnance billet upper and Centurion Arms CMR (1 replies)
Aero upper and KMR Alpha rail (7 replies)
Diagnose my 7.5" pistol feeding issues, please (11 replies)
Ma trigger came in, ? (33 replies)
KAC URX 3.0, Gas Ports, Gas Block Selection (13 replies)
Factory Colt upper that apparently doesn't exist, or does it? Info request. (8 replies)
Carbon build up around gas block? (5 replies)
Gas Port Data (111 replies)
Removing a rifle receiver extension: it's really stuck (21 replies)
Lower Receiver Dimension Issues? (8 replies)
Dimension needed (2 replies)
F-Marked vs Standard A2 FSB on Flattop AR with 20" Barrel and Rifle Gas (22 replies)
Huuuge groups today, what's going on? (108 replies)
AR15 Malfunction (6 replies)
DD Mark 18 Blowback Issues (32 replies)
Short stroking mid length (5 replies)
Springfield Saint barrel (14 replies)
Radian Charging Handle fit HK MR556? (2 replies)
Del Ton vs. Criterion Chrome-Lined Lightweight 20" Barrel (10 replies)
Recoil Springs (11 replies)
11.5" mid (27 replies)
Can a magazine cause failures to *eject*? (12 replies)
BCM Published Specs? (3 replies)
Geissele Super 42 Receiver Damage (31 replies)
Should I test fire a few rounds after a complete breakdown/cleaning? (21 replies)
Recommendation for a semi-lightweight 18" precision barrel (27 replies)
AR started firing on trigger reset and went FA a few times today (13 replies)
Crush Washer or Peel Washers? (23 replies)
Torque Wrench Calculator ( Angle + Length ) (19 replies)
Faxon Gunner 20" or 18" Barrel Accuracy? (9 replies)
Criterion 223 Wylde Reliability (15 replies)
KAC 14.5 Mod 2 Upper CHANGING Muzzle Device Advice (45 replies)
BCG eats gas rings (55 replies)
Barrel torque magpul wrench (36 replies)
Colt Combat Unit Carbine vs Sionics Patrol Rifle III (42 replies)
Failure to Feed; Was Failure to extract (35 replies)
LPK for ambi Mega Arms lower (9 replies)
6940 Folding Front Sight Gas Block (7 replies)
More companies using 9310 bolts, why is this? (2 replies)
Recs for Lightweight Unsuppressed 11.5" Barrel? (4 replies)
Gas Tube/Gas Key Making Contact (11 replies)
Plugs In Lower Receiver? (3 replies)
JP tuned spring in A5 buffersystem (26 replies)
DI or Piston? (164 replies)
First lower build questions (23 replies)
Why aren't monolithic uppers standardized? (35 replies)
H6 Buffer in BCM mid length. (16 replies)
Average price for 'smith to assemble an AR? (21 replies)
Carbine Vs Middy (33 replies)
Wear marks on buffer face (17 replies)
DD complete upper, looking for lower advice. (21 replies)
Kac 2 Stage Trigger Issue? (5 replies)
Reset Issue on DDM4 with Tac-Con & SlideFire....... (47 replies)
What ammo for bcm 14.5 lw bbl @ 300 yds? (19 replies)
New LE6920s...is this a QC issue? Or am I reading into it too much? (23 replies)
Shaved front sight under kmr (63 replies)
How does this castle nut staking look? (27 replies)
Help with case head separation (39 replies)
Quick trigger guard roll pin question (19 replies)
DD MK18 begining to keyhole (34 replies)
Help with failures to extract ... found potential cause ... do not understand (7 replies)
Is it time to try some barrel nut shims? (51 replies)
Magpul QD Swivel socket (11 replies)
FSB removal and re-installation: FSB alignment... (33 replies)
KAC SR-15 E3 Mod 2 URX 4 removal (16 replies)
Lightweight BCG & .300 blackout... Stupid Idea? (6 replies)
Gas port sizing (11 replies)
Help me troubleshoot FTE (eject) please (32 replies)
A15 won't cycle (6 replies)
New Adams Arms Agency Carbine and a few questions (16 replies)
Colt Expanse Kaboom (154 replies)
Help me find some new fangled FSB bench block (for FSB removals)? (21 replies)
Chrome Lining Process (11 replies)
Newb gas block question (25 replies)
Taking off an LMT FSB separates the men from the boys. (10 replies)
Best Barrel (18 replies)
Has anyone used the Armaspec XPDW stock? (5 replies)
Anybody use this trigger? (10 replies)
new build - SLR sentry 7 adj GB issue (62 replies)
Gas block for Colt 6920 barrel (18 replies)
H3 Buffer (28 replies)
SSA-E not resetting with suppressor (22 replies)
Best general port size for MK18 build (30 replies)
AR Tuning and Out of Spec Parts (6 replies)
Question about barreling an upper receiver (6 replies)
Buffer Issue that Doesn't Make Sense to Me, Please Explain (37 replies)
Magpul MOE fixed carbine stock and BCM A5 RE (0 replies)
removing tight fit barrel (21 replies)
Gas block question.. Is it salvageable??? (23 replies)
Is the barrel of the FN 15 Tactical II made from the M249 material/chrome? (0 replies)
Drop in (2 piece) free float handguards. (34 replies)
Gas-port regulating gas-block insert install and DIY manufacture. (148 replies)
Why PMAGs are better than aluminum USGI (53 replies)
Bolt Lug (wear) cause (6 replies)
Questions regarding pinning and welding muzzle devise on barrel? (10 replies)
Rifle Buffer with Tungsten Weight(s)? (32 replies)
Feeding/Extraction issues (26 replies)
Rail for Noveske 12.5 barrel and Sico ASR Flash hider (8 replies)
Lifespan & wear of 5.56 AR barrels vs. .308 AR barrels. (11 replies)
Chrome Lined VS Not (60 replies)
Gas port size for a 14.5" Colt socom barrel? (38 replies)
Dry FIRE?? DESPITE SUCCESSFUL STROKE?? (24 replies)
Feeding issue, narrowed down to bolt. (13 replies)
Swapping my ambi safety selector to other side? (2 replies)
Please help troubleshoot my AR! (16 replies)
Magpul Armorers Wrench (8 replies)
Question about Daniel Defense Rail (4 replies)
Enlarge 0-2 aperture? (8 replies)
Basic Troubleshooting 101 (2 replies)
New guy with a bolt carrier question (15 replies)
Help me diagnose what is causing this (25 replies)
Knights Armament Safety Detent Questions (2 replies)
Which A5 buffer to use with SR-15 11.5 CQB MOD 2? (35 replies)
Function testing magazines (27 replies)
Hammer and Trigger pins moving (9 replies)
The ratcheting castle nut (8 replies)
Help Ar 15 short stroking ! (22 replies)
Seriously BCM? What do you use for FSB pins? Or: Never invade Russia in Winter. (78 replies)
AR Build (20 replies)
Gas block leakage? (7 replies)
Ever had an Extractor Spring/Insert/O-Ring just fall out? (13 replies)
Blown primers (Independence XM193i related) (15 replies)
Odd wear in a BCM upper? (9 replies)
BCM ELW barrel, possible to install a fixed front sight? (5 replies)
Trimming takedown detent spring? (6 replies)
Safety detent hole too shallow (10 replies)
BCM gas block and Centurion CMR rail- shave it? (6 replies)
What is the Proper Method for Installing Extractor Springs? (6 replies)
Crane O ring needed on a middy? (22 replies)
Upper Receiver Decision (12 replies)
Where's the PSA chf nitride barrel from? (36 replies)
Chg handle question (2 replies)
So bcg in nickle boron or hard chrome (31 replies)
Weird FTE problem with my carbine (11 replies)
Pin .625" gas block on BCM 16" ELW barrel? (10 replies)
Colt 20 Round Magazines - Worth Upgrading? (15 replies)
USGI mags outlast all others (108 replies)
Chrome Lining uneven at muzzle (4 replies)
Notched ar15 hammer? (3 replies)
Feed Ramp Wear (13 replies)
Function of mid-length gas vs. LMT enhanced carrier? (5 replies)
How to install an AGB on a bbl. with taper pin holes (2 replies)
overtorqued question (4 replies)
Handguard Recommendation for a Noveske 12.5in Mid Length to Cover Gas Block? (15 replies)
Flash hider torquing (18 replies)
Anyone have an 11" Troy Alpha MLOK? Looking for exact length measurement... (0 replies)
Leveling crosshairs (26 replies)
.223 vs 5.56 go no gauges? (20 replies)
The absolute best way to mount your BUIS...anybody ever welded? (46 replies)
Buffer/BCG question (9 replies)
Bolt catch/release loss of spring tension (59 replies)
Where does the URX 1/2/3 and URX 4 stand in the rail "hierarchy"? (3 replies)
Ruger SR-556 Takedown (piston) Technical Spec CHANGES for 2016 Discussion (1 replies)
Building a website 14.5 mid dissipator question (3 replies)
Properly Staked carrier key (15 replies)
What mount/rings to get? SPR/Varmint rifle. (2 replies)
Short cycling 308. Need some help. (9 replies)
How to (not) build a BCG via RRA (0 replies)
Build a BCG Like an Idiot? Surprisingly Useful Article from TFB (38 replies)
Running a small port barrel (21 replies)
House fire rifle risks (27 replies)
Urx4/carbine fsb (2 replies)
Why no new DI designs? (36 replies)
Canted muzzle brake/suppressor misalignment (5 replies)
Shortening 6920 to 12.5 (9 replies)
Mk18 vs bcm/etc with 11.5 barrel and A5 buffer? (8 replies)
Need help ID a rail system by looking at the barrel nut (7 replies)
Help with a barrel ID (0 replies)
5.56 vs .223 identify barrell (9 replies)
Lower damage (18 replies)
Extraction: Expanse Upper (22 replies)
Full auto help (17 replies)
Law tactical folder + Vltor A5? (2 replies)
Bolt not locking on last round (34 replies)