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Old September 03, 2008, 16:25   #1
W.E.G.
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interchangeable parts - inch versus metric

interchangeable parts - inch versus metric

muzzle device
NO - threads are same pitch but turn opposite ways

barrel
YES - although inch requires a breeching washer

gas block
YES - although metric port meets barrel perpendicular, whereas inch meets at angle, also inch block is taller

gas knob
NO

gas knob retaining clip/spring
NO

gas plug
NO

gas piston
YES

gas piston spring
YES

gas tube retaining collar (the part that screws into the receiver)
YES (small issue here - but generally the answer is yes)

front sight
NO

front sight plate
(metric only)

front sight plate spring
(metric only)

front sight retaining scrw
(inch only)

handguards
YES

handguard screw
SOMETIMES - depending on source and length

handguard ring
YES

front swivel
YES

upper receiver
YES - (more or less), depending on what you hang on it

lower receiver
YES, if simply installing a complete lower from one type onto another

ejector block
YES

ejector
YES

bolt
YES

extractor
NO unless it is already installed on a bolt

extractor plunger
???

extractor spring
??? I think so

bolt carrier
YES

firing pin
generally NO -- except the discussions of one-piece and two piece firing pins, and the differing lengths and configurations, give me a brain cramp
Most metric is one-piece, and most inch is two-piece. So that settles the issue for general comparisons

firing pin spring
??? - don't think so - although it may be if a two-piece firing pin is used in a metric rifle.

firing pin retaining pin
YES

rat tail
YES

rat tail spring
YES

rat tail rivet
YES

bolt hold-open
metric fits inch but not vice-versa (inch is fatter)

bolt hold open retaining screw
YES

magazine catch
YES, but be careful of spring length (inch is longer)

magazine catch spring
NO - unless you switch the magazine catch at the same time - inch is longer

rear sight
YES - but heights differ (inch is taller)

rear sight screws
YES

top cover
metric will work on inch - but not vice-versa without bubbafication

trigger axis-pin
??? I think so

hammer axis-pin
??? I think so

hammer
NO

trigger
NO

sear
NO

hammer spring
NO

hammer plunger
NO

trigger plunger
NO

sear plunger
NO (inch doesn't even have a sear plunger)

sear spring
NO

trigger return spring
NO

hammer spring
NO (inch plunger and spring are hermetically-sealed assembly)

hammer spring shroud
NO

locking plate
NO (inch plate is unitized with lower)

selector
metric fits inch, but inch won't fit metric without modification

recoil springs
YES (both)

recoil spring plunger
YES

recoil spring tube
YES

recoil spring retaining nut
YES

locking shoulder
YES

locking body
YES

locking body plunger
??? I think so

locking lever
yes

locking body spring
yes

locking lever retaining screw
??? I think so

buttstock
NO

buttplate
NO

buttplate retaining screw
sometimes sorta (depends on configuration and length)

rear swivel
NO

pistol grip
NO

pistol grip retaining nut
NO (inch has a screw)

pistol grip retaining scrw
NO (metric has a nut)

trigger return plunger retaining plate
(inch only)

pistol grip "popsicle stick"
(inch only)

trigger guard
NO

magazine
metric usually fits inch, but not vice versa without modification

magazine followers
disagreement over this issue - most say NO

magazine springs
disagreement over this issue - most say NO

magazine floorplate
NO
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Old September 03, 2008, 16:25   #2
W.E.G.
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I'm sure I forgot something, and there are a couple gaps in my certainty - indicated by ???

comment as you spot issues
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Old September 05, 2008, 11:27   #3
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???
The rear part of metric and inch two piece firing pins are identical, the front pieces are not. Metric bolt=metric firing pin, inch=inch.

Israeli Selector is another species.

Hammer shroud, spring, and plunger can be used in either lower if replaced as a set. Metric will self disassemble if your inch lower is uncocked when open.

Charging handles, metric in inch needs a spot drilled for the detent. Inch in metric needs to be thinned and receiver or handle modified so it will fold and lock.
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Old June 06, 2009, 21:38   #4
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What about carry handles?

Most seem to mention heavy barrel vs standard, and not sure how to identify the HB vs standard.
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Old March 25, 2010, 20:19   #5
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So from what I read here, a new pair of metric handguards from DSA will fit my L1A1?
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Old March 21, 2014, 14:58   #6
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bump
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Old April 07, 2016, 19:47   #7
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Bump
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Old December 21, 2016, 09:33   #8
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So why did you delete all my corrections?
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