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View Full Version : AR Technical Discussion



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  1. Failure to go into Battery on only first round.
  2. Firing Pin Replacement Interval
  3. Barrel Help
  4. Repinning a Barrel ???
  5. Upper Receiver Question
  6. SLR Rifleworks Sentry 7 setscrew adjustable gas block review
  7. Removing/Replacing Sight Tower Gas Block with Aftermarket
  8. Barrel Nut
  9. V7Weapons parts review
  10. Heavier Buffer & Buffer Spring: Worth It?
  11. barrel tuners
  12. Delete
  13. M855A1 with H6 buffer?
  14. Buffer tube
  15. LaRue SPR15
  16. DPMS M111 Handguard
  17. Malfunction diagnosis
  18. I'm just a wrench
  19. Bolt pin sticking out?
  20. Tips for precision assembly?
  21. Buffer Tube with extended lip
  22. Calibrated overgassing
  23. Buffer Issue
  24. Magpul Gen 1 and 2 -20 round magazines
  25. Loose barrel extension on melonite treated barrel...
  26. Grooves in Daniels Def lower kit. problem?
  27. Question about alignment between receiver and forend rails
  28. Legality of removing a pinned brake
  29. UPDATE 17 July 2014 - Appears Gas Key Striking Lower- Input Please
  30. Collapsing stock with rifle-length barrel question
  31. trigger guard disassembly prob
  32. Daniel Defense Barrel Quagmire.....
  33. Heavier buffer vs changing gas flow for smoother shooting
  34. Friend was dumb, dowel stuck in barrel.
  35. invisible to the eye fsb causing inaccuracy with scope?
  36. Want to build a solid and accurite 20" upper to put on my Colt MT6400 lower??
  37. Bolt carrier chrome, cause for concern?
  38. Removing fsc 556 compensator and replace wth?
  39. Unable to Stake Castle Nut
  40. Do I need to check headspace?
  41. AR-15 kabooms & lowers?
  42. FSB sling mount removal tool input
  43. Shortening a melonite barrel
  44. rra 223/5.56 wylde?
  45. MK18 front flip up sight (kac)
  46. Switching handguards with perm'd muzzle device?
  47. Installing DD Lite rail
  48. Wolff Buffer Springs: Composition/Lifespan?
  49. Sight post height 14.5" M4
  50. Effin' barrel nut
  51. H6 Buffer in 18" SPR
  52. VLTOR A5 vs. AR-10 RE size?
  53. Extractor Spring Insert?
  54. Truing upper receiver face?
  55. Weight Difference Between LMT MRP and LM8 Uppers
  56. Excessive windage?
  57. Colt LE6951 and Loose MOE Handguards
  58. Carbine buffer
  59. Upper Receiver Gas Tube Hole Height?
  60. Osprey Defense Pist Conversions
  61. Bolt Carrier Machining?
  62. Geissele mk4 adjustable gas block
  63. Tactical Intent RE.
  64. 14.5 Perm attached FH and Barrel Questions
  65. Improperly Staked BCG?
  66. Bolt catch won't catch bolt
  67. Melonite/nitride barrel recommendations (1/8)?
  68. Cannot remove bolt catch detent.
  69. Geissele Reaction Rod Compatibility
  70. Barrel extension wear part 2
  71. Cleaning and servicing ejector
  72. dd front sight ?
  73. Another New to Me Type of Malfunction
  74. Looking for hand guard for gas piston AR
  75. Quick question about dwell time:
  76. Feedramp and Receiver Interface ... Something Doesn't Look Quite Right
  77. Need help in a diagnosis.
  78. Quick barrel/gas port question!
  79. QD Swivel Clearance on C4 Rail
  80. Gen2 20rd Pmags not working with DD V7
  81. Disconnector spring tension
  82. Trigger group pin backing out
  83. Another Failure to lock back the bolt carrier issue
  84. KMR Railed Upper Receiver Swap?
  85. Barrel length from a fixed front sight to the flash
  86. KAC Rail Length W/PVS-24
  87. BCM 18" rifle vs BCM SPR
  88. LMT - MRP piston questions
  89. Changing rails on DDM4V5
  90. Hazards of hammering out stuck, live rounds
  91. Muzzle brake shroud legality?
  92. Long term reliability of low power trigger springs
  93. La Rue Rail Removal
  94. barrel nut torque
  95. Need advice for weight distribution fix
  96. My problem child AR. WTF???
  97. BCM Forward Assist Issue
  98. How to remove gas tube from Noveske Switchblock?
  99. Accuracy problem.
  100. phase 5 tactical bad lever ?
  101. Noveske/Silencerco Video
  102. Quick BCM KMR rail install / removal question
  103. How much difference will a lower make
  104. Need Help ID'ing a DD Rail
  105. Depth of Pin hole for MB pinning?
  106. FTEs on a franken
  107. AR Barrel Chamber Question??
  108. DD RIS II Barrel Nut Torque
  109. Broken casing- just cheap ammo or something else?
  110. Gas system not working
  111. MUR-1A and Offset Sights
  112. Gas port size junkies-PSA report
  113. Steps to replace a flash hider properly?
  114. Gas vs Barrel Length
  115. New BCM lower: mag release protrudes out left side of receiver when pressed/sticks
  116. Cerakote finish issues - acceptable or not?
  117. Who can nickel Teflon coat gun parts?
  118. FSB, 16" M4 barrel and 9" + handguard
  119. My project on RocketHub
  120. M4 Feed Ramp Issue
  121. 5.56 to 7.62x39mm AR refit, What parts are required?
  122. Removing Daniel Defense RIS on a 14.5" barrel w/ pinned flash hider...
  123. Melonite
  124. Gas Block Loose Around Barrel
  125. In defense of the Fortis Rev
  126. I remember now why I prefer B5 and Vltor stocks...
  127. Crazy muzzle device installation - what?
  128. Magpul MOE SL Hanguard clearance issue with Eotech 552, modification required
  129. surefire muzzle brake install questions
  130. Factory KAC 14.5" MOD1 Dimple Barrel - Problems
  131. New SS Barrel gas port burr internally--something to worry about?
  132. noveske tight tolerance stacking
  133. Trigger replacement for Colt AR LE920
  134. Felt difference between muzzle devices
  135. Midwest Industries SS Gen 2 Keymod or?
  136. Barrel/rail length question
  137. SEEKINS SBA15 LOWER vs. BAD-ASS-ST AMBI SHORT THROW 50
  138. Hayes Research sights vs. HK sights
  139. Vise Blocks
  140. 5.56 in a .223
  141. Problems with BCG
  142. Problem with BCG sticking forward when cycling
  143. Question on anodizing ?
  144. kraiger drop in AR15 20" Hbar barrel
  145. Noveske m4 ejection pattern
  146. Long Stroke VS Short Stroke Gas Piston VS Gas Direct Impingement Bolt Group
  147. Lapping the receiver face
  148. MK262 mod 1 load data
  149. DD Lite Rail Barrel Nut?
  150. AR15 accuracy hierarchy? Checklist of accuracy killers in order of likelihood?
  151. Precision Armament EFAB first impressions
  152. New lower question
  153. Ejector Failure
  154. How to Remove Strike UDC!?
  155. AR Gas System Lengths Explained and Illustrated
  156. What does "government profile" mean to you?
  157. Trigger disconnect/Hammer malfunction
  158. Leaking Gas Block
  159. Mega barrels
  160. Receiver seriously scratched by CMMG 22LR conversion bolt.
  161. 10.5 SBR upper: accuracy
  162. Light Strikes
  163. Barrel Length and Twist Rate
  164. Stock Pinning
  165. Colt AR15A4 Help
  166. Excessive Wear in My AR
  167. Upper wear question.
  168. New bolt lugs - file off sharp edge?
  169. Firing Pin Protrusion Gage/Gauge - Who Sells Them?
  170. Determining if new barrel is needed?
  171. Gas key leak
  172. Discolored barrel
  173. SLR rifleworks complete uppers
  174. Using old bolts in new barrels
  175. Gas tube length reliability
  176. Running a BUIS with no elevation?
  177. Barrel Extension Lugs Peening?
  178. Syrac Gen.II Gas Block Feedback And Fit Under DD Lite Rail II?
  179. How to affix castle nut
  180. VLTOR A5 on SBR
  181. 18 inch, Rifle lenght gas system, melonite barrel suggestions
  182. Tight Barrel Extnesion SS Barrel
  183. Q for an experienced 223/556 reloader
  184. Will the complete lower i ordered come with take down pins?
  185. Colt Sporter M4 Carbine safety
  186. Colt 6920 Sling Swivel Roll Pin Size
  187. Detent Spring - HELP NEEDED ASAP!
  188. Buffer weight rattle?
  189. noveske serial number date code
  190. Adams Arms chambering issues
  191. Geissele B-GRF trigger
  192. BCM 14.5" Midlength Malfunction Issues
  193. KAC URX 3.1 8" + Daniel Defense Clamp on Gas Block
  194. Griffin Blast Shield Toughts
  195. Veteran's Day giveaway
  196. Rguns Nickel Boron Bolt Carrier Group - Finish flaking off
  197. New Build Idea...
  198. Does muzzle crown matter when running a muzzle device?
  199. Takedown and Pivot Pin Detent
  200. Mystery screw from LE6920?
  201. .30 cal compensator on a .223, how much lost performance?
  202. Help with ugly FTE
  203. BCM 11.5 Short Stroking?
  204. BCM Lower Buffer
  205. Carrier Tilt?
  206. BEV vs. Reaction Rod vs. Barrel Extension Torque Tool
  207. M4 feedramp anodizing wear?
  208. Nib vs Phosphate at 100x magnification
  209. Daniel Defense Lite rail II 12" FSP question.
  210. Need help diagnosing an accuracy issue...
  211. 1st AR build
  212. LANTAC Enhanced-BCG
  213. ? on Colt Sear Block
  214. Cracked staking?
  215. Free Floating Rail Floating Away
  216. Will it fit? 13.7" barrel and suppressor.
  217. Machining melonite/nitride-coated barrels - who?
  218. PWS Piston with Law Tactical Adapter
  219. Can't Remove Unfired Round
  220. Rainier barrel question
  221. Stag supplying M16's to the Army?
  222. Geissele G2S installation issue
  223. Damage Industries QD Reciever End Plate
  224. Rail Options for a POF Puritan
  225. Corrosion on LE6920 upper?
  226. barrel burr
  227. Magpul SL stock / AAC upper / BCM Gunfighter Mod 5 clearance issue
  228. Trigger
  229. sbr not firing every round
  230. Polygonal Rifling
  231. Rainier Barrel
  232. KAC mod 2 gas system
  233. Wanted: Actual OAL of Handguards
  234. Cutting Down a BCM KMR?
  235. Question about spring from Colt LPK
  236. Mega Ambi charging handle
  237. See if you can spot the issue.
  238. Can a muzzle device change POI? ...by a lot?
  239. LMT MRP accuracy issue
  240. To end the NiB argument once and for all...
  241. Trouble installing Unity VFG
  242. can i turn a dd omega 9 rail into a fsp cutout rail without problems
  243. 12.5" barrel on a mid-length gas system???
  244. Should a carry handle rear sight do this?
  245. How Does Colt Permanently Attach the Flash Hider on the LE6921CK (PB) 14.5 IN Uppers?
  246. Buffer Weight in MK 12 with A5 Extension
  247. Thorough Test and Data Analysis of Barrel Length and 5.56
  248. AR build light primer strike problem fixed but what caused it?
  249. Best place to Start collecting AR tools
  250. AR/M4 Production? Business idea...