ar15 bad vibes with new upper

IAMACLONE_2

August 16, 2002 11:53

this is a colt sp1 preban, orginal 20" hbar.
bought a asa 16" preban complete upper with bolt assy, fired apx 100 rds through it.
noticed like a tuning fork like harmonic when fired with the new 16" upper.
i did not swap back to the 20" upper to compare, it was at home.

any hints or suggestion welcomed.

thanks walte

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  spclark

  August 16, 2002 14:28

  I'll take a shot at guessing it's a sheet metal heat guard inside the forend, unless your changing the stock & recoil buffer spring along with the new upper. I've taken to smearing moly grease over my spring & buffer just to avoid the sproiiiiingnnggnnggg from my Bushmaster's....

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  leeblackman

  August 16, 2002 15:16

  Ah, the sproing. Its absolutely normal. Every AR has the sproing. It wouldn't be an AR if it didn't have the sproing. Believe me, you'll learn to enjoy it. Its nothing more than the reverberation of the recoil spring in the buttstock. There are a few things you can do to get rid of it, but I wouldn't waiste my time or money.
  
  If I'm wrong please correct me, I won't be offended.
  
  The sound of a 12 gauge pump clears a house fatser than Rosie O eats a Big Mac !

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  IAMACLONE_2

  August 16, 2002 16:19

  thanks guys, ill try cleaning & lubing recoil buffer assy
  gun had not been shot for over 3yrs, been in the safe
  did not check buffer assy prior to range
  
  just now pulled recoil buffer assy out, found like old wd40 browish sticky goo on spring & buffer.
  no wonder its was humming, the recoil spring was binding the buffer tube. nothing hurt thats good
  
  well i know what ill be doing this weekend.
  
  thanks walte

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  leeblackman

  August 16, 2002 16:55

  Icky...
  
  If I'm wrong please correct me, I won't be offended.
  
  The sound of a 12 gauge pump clears a house fatser than Rosie O eats a Big Mac !

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