Smith & Wesson Forum

Go Back   Smith & Wesson Forum > Smith & Wesson Semi-Automatic Pistols > Smith & Wesson M&P Pistols
o

Notices

Smith & Wesson M&P Pistols All Variants of the Smith & Wesson M&P Auto Pistols


Reply
 
Thread Tools Display Modes
  #1  
Old 05-13-2014, 03:22 AM
total_newbie total_newbie is offline
Member
Bore Conditions Bore Conditions Bore Conditions Bore Conditions Bore Conditions  
Join Date: Dec 2013
Posts: 16
Likes: 26
Liked 0 Times in 0 Posts
Default Bore Conditions

Hi Everyone,

I just got my M&P Pistol brand new, and the picture shows the bore conditions.

Does the bore look normal to you?
The lanes (I think that they are called grooves?) do not seem to be even or leveled.
Is that okay?

Thank you
Attached Images
File Type: jpg From_Chamber_1.jpg (16.2 KB, 213 views)
Reply With Quote
  #2  
Old 05-13-2014, 03:39 AM
307-Niner's Avatar
307-Niner 307-Niner is offline
Member
Bore Conditions Bore Conditions Bore Conditions Bore Conditions Bore Conditions  
Join Date: May 2014
Location: Wyoming
Posts: 928
Likes: 1,440
Liked 1,473 Times in 450 Posts
Default

Brand new & never been fired, right? Have you cleaned it yet?

I bet it will look better after you do.
__________________
-Roger
Reply With Quote
The Following User Likes This Post:
  #3  
Old 05-13-2014, 06:56 PM
dullh's Avatar
dullh dullh is offline
Member
Bore Conditions Bore Conditions Bore Conditions Bore Conditions Bore Conditions  
Join Date: Mar 2013
Location: Horse Shoe, NC
Posts: 835
Likes: 30
Liked 485 Times in 239 Posts
Default

If you expected the factory to ship out clean pistols, well...they don't. Clean it before your first trip to the range is the usual advice...

The lands are the "ridges" in the bore. The grooves are the "valleys" from which the caliber of the bore is derived. These lands and grooves are cut in a circular fashion, to give the fired bullet it's twist rate...that is, the bullet doesn't just fly out of the end of the barrel...it spins in flight. The common convention is the right hand twist, which means the bullet spins clockwise as viewed (if it was possible) by shooter from behind the gun. Some guns have a left hand twist, which is not as common. The twist rate is a ratio the distance it travels per revolution, in inches. A twist rate of 1:12, for example, means the bullet makes one complete revolution for every 12 inches it travels. If your barrel is 12 inches long, that means the bullet makes one complete revolution as it exits the muzzle.

When the firing pin strikes the primer, it causes a detonation of the primer, not an explosion. The flame from the primer ignites the powder, which again, makes the powder burn, not "explode". This burning causes hot expanding gases, which drive the bullet out of the case and into the bore. When the bullet enters the bore, it is squished and elongated by the lands to match the confines of the bore - this seals up the bore, so hot expanding gases don't pass the bullet, but instead push the bullet down the bore. If the gases pass the bullet in the bore, this is an undesirable condition called blow-by which affects velocity and accuracy. This is also why bullets are made of soft metals - so they can be squished and elongated by the lands in the bore.

The loud BOOM you here when you fire any gun is all those gases leaving the bore behind the bullet - the gases expand violently against atmospheric pressure, since they're no longer confined to the bore and chamber.

I know I went overboard with this but maybe it will help some "noobs" understand what goes on when they press the trigger...
Reply With Quote
The Following 5 Users Like Post:
  #4  
Old 05-13-2014, 07:15 PM
Johnmuratore's Avatar
Johnmuratore Johnmuratore is offline
Member
Bore Conditions Bore Conditions Bore Conditions Bore Conditions Bore Conditions  
Join Date: Sep 2013
Location: Mass
Posts: 635
Likes: 659
Liked 468 Times in 200 Posts
Default

Does the bore look normal to you?

Yes, it looks perfectly normal.
Reply With Quote
The Following User Likes This Post:
  #5  
Old 05-13-2014, 08:39 PM
MichiganScott MichiganScott is offline
Member
Bore Conditions Bore Conditions Bore Conditions Bore Conditions Bore Conditions  
Join Date: Jan 2012
Location: God's Country
Posts: 4,711
Likes: 1,235
Liked 3,535 Times in 1,770 Posts
Default

How'd it look after you cleaned it?
Reply With Quote
  #6  
Old 05-14-2014, 12:26 AM
total_newbie total_newbie is offline
Member
Bore Conditions Bore Conditions Bore Conditions Bore Conditions Bore Conditions  
Join Date: Dec 2013
Posts: 16
Likes: 26
Liked 0 Times in 0 Posts
Default

Thank you very much, everyone.

A special thank to DullH for the awesome explanation.

To MichiganScott, I have not cleaned it yet. I am betting on 307-Niner/Roger that it will look better after.
Reply With Quote
  #7  
Old 05-14-2014, 02:41 AM
Rastoff's Avatar
Rastoff Rastoff is offline
Member
Bore Conditions Bore Conditions Bore Conditions Bore Conditions Bore Conditions  
Join Date: Dec 2011
Location: So Cal (Near Edwards AFB)
Posts: 14,710
Likes: 2,926
Liked 17,102 Times in 6,271 Posts
Default

It's very difficult to take pictures of the bore. That doesn't look normal to me, but it could be dirty. I'd like to see a picture after the cleaning.
__________________
Freedom isn't free.
Reply With Quote
  #8  
Old 05-14-2014, 11:31 AM
Ofc.JL's Avatar
Ofc.JL Ofc.JL is offline
Member
Bore Conditions Bore Conditions Bore Conditions Bore Conditions Bore Conditions  
Join Date: Jan 2009
Location: High Plains of Texas
Posts: 302
Likes: 33
Liked 153 Times in 99 Posts
Default

Clean it really good, and then look. Those marks may well be some sort of chatter marks or material flaw. Usually, bit chatter marks are not so random as your marks are, so it may well be that it justs needs cleaning. But then again, I have seen all sorts of bizarre things in barrels. Out here in west Texas, in several cases, I have seen scratch marks from the rifling leade up into the rifling itself. Cause? An accumilation of fine "Blow" sand that is real common out here(You oughta see some of our Dust Storms. Troops stationed in the middle east that are from here say they feel right at home when a "Haboob" blows in!) in the leade area in front of the bullet. Upon firing the weapon, the sand acts like it's abrasive self and does it's thing when it gets pushed by the bullet. Just past the leade and first rifling area, gas blow by clears out the sand so it no longer is there and Voila!, scratches in the leade area. It causes no problems with the function or accuracy of the weapon, but boy, does it look bad.
Anyway, clean it and check again. If they are deep, Contact S&W for assistance.
Ofc.JL
__________________
LEO, Instr, Armorer, Gov's 20
Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Laser bore sighter left in bore.. BOOM 84CJ The Lounge 15 01-08-2016 04:23 PM
Medical conditions one learns about on TV CAJUNLAWYER The Lounge 46 10-03-2015 12:26 AM
Snow and road conditions 158Grain The Lounge 20 02-22-2013 07:28 PM
Dirty bore stabilizes cast bullet, clean bore does not? David Sinko Reloading 29 12-14-2011 09:30 PM
Hoppe's Elite Conditions to Reduce Cleaning Time 80%? dwever S&W Revolvers: 1980 to the Present 2 10-03-2011 01:16 PM

Powered by vBadvanced CMPS v3.2.3
smith-wessonforum.com tested by Norton Internet Security smith-wessonforum.com tested by McAfee Internet Security

All times are GMT -4. The time now is 04:42 AM.


Smith-WessonForum.com is not affiliated with Smith & Wesson Holding Corporation (NASDAQ Global Select: SWHC)